Tag: engineering

Getting and Installing Linux – Part 2

6:01 am

Obtaining and installing a Linux Distribution

by James Stephens

Almost any Linux distribution runs great on today’s hardware. But I’m writing this with aging computers in mind. With older computers it’s a good idea to know how much RAM (often referred to as physical memory) you have in order to select a distribution that will work well with your machine.

With Windows this can be shown by opening “System” in “Control Panel.” RAM or physical memory will be expressed in Mb or Gb. Once you know this, you are armed with the knowledge to select a distribution.

For machines with 512 Mb RAM and up I recommend a distribution from LinuxMint. For machines with under 512 Mb RAM I recommend Bodhi Linux 32 bit legacy.

Operating systems come in 32 bit and 64 bit versions. With the exception of replacing Windows 8.1 and 10, a 32 bit distribution will work on any computer. (More about Microsoft and UEFI later.) At one time a 64 bit opening system allowed the use of more memory then it’s 32 bit kin. But with modern 32 bit distributions this is no longer an issue. So if you want to play it safe choose a 32 bit distribution.

LinuxMint offers a choice of desktops and the website does a good job explaining the advantages of each. I would recommend LinuxMint 17.3 MATE 32 bit edition as most likely to work on any computer. But take a look at each of them and see which one you like. As long as you follow the minimum RAM requirements guidelines as listed in the description you will be okay.
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China’s space plans for the rest of 2016

8:42 am

The competition heats up: If all goes as planned, 2016 could be China’s busiest year ever in space, and could set the stage for making it a major player for years to come.

They will not only launch their next space station test module, they will introduce a new rocket capable of putting about 25 tons into orbit, making it one of the most powerful rockets available. In addition, they are moving forward aggressively on planetary missions to Mars and the Moon, and on the followup larger space station designed to teach them how to transport people between the planets.

While the US is still substantively far ahead in space, the optics can suggest otherwise.

First, China will be launching people into space, which the US have not had the capability to do since the shuttles were retired in 2011, relying on Russia to get its astronauts to the ISS. Next, the International Space Station is currently only funded to 2024, which means the [Chinese space station], expected to be completed around 2022, could be the only game in orbit. Another issue is that it is becoming increasingly apparent that China is developing technologies and techniques necessary to take its taikonauts to the Moon, and ESA and Russia also have that destination in mind.

As the article notes, the private sector is the U.S.’s trump card (no pun intended).

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Juno has entered Jupiter’s magnetic field

6:34 pm

After five years of travel, Juno last Friday entered Jupiter’s gigantic and very powerful magnetic field in its approach for its July 4 orbital insertion.

Meanwhile, they have uploaded to the spacecraft its final software commands for that orbital insertion.

At about 12:15 pm PDT today (3:15 p.m. EDT), mission controllers will transmit command product “ji4040” into deep space, to transition the solar-powered Juno spacecraft into autopilot. It will take nearly 48 minutes for the signal to cover the 534-million-mile (860-million-kilometer) distance between the Deep Space Network Antenna in Goldstone, California, to the Juno spacecraft. While sequence ji4040 is only one of four command products sent up to the spacecraft that day, it holds a special place in the hearts of the Juno mission team. “Ji4040 contains the command that starts the Jupiter Orbit insertion sequence,” said Ed Hirst, mission manager of Juno from NASA’s Jet Propulsion Laboratory in Pasadena, California. “As soon as it initiates — which should be in less than a second — Juno will send us data that the command sequence has started.”

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Hubble images Jupiter and its aurora

9:03 am

Jupiter and its aurora

Cool image time! In anticipation of the arrival of Juno in orbit around Jupiter on July 4, scientists have released a spectacular image of Jupiter and its aurora, taken by the Hubble Space Telescope. The image on the right has been reduced slightly to fit on the webpage.

The main focus of the imaging is the aurora.

To highlight changes in the auroras, Hubble is observing Jupiter almost daily for several months. Using this series of far-ultraviolet images from Hubble’s Space Telescope Imaging Spectrograph, it is possible for scientists to create videos that demonstrate the movement of the vivid auroras, which cover areas bigger than the Earth.

Not only are the auroras huge in size, they are also hundreds of times more energetic than auroras on Earth. And, unlike those on Earth, they never cease. While on Earth the most intense auroras are caused by solar storms — when charged particles rain down on the upper atmosphere, excite gases, and cause them to glow red, green, and purple — Jupiter has an additional source for its auroras.

The strong magnetic field of the gas giant grabs charged particles from its surroundings. This includes not only the charged particles within the solar wind, but also the particles thrown into space by its orbiting moon Io, known for its numerous and large volcanos.

I have embedded below the fold one of the videos of the aurora, taken over time by Hubble. Quite amazing.
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Rosetta’s finale set for September 30

8:41 am

The Rosetta science team has set September 30th as the date when they will complete the spacecraft’s mission with a controlled descent onto Comet 67P/C-G’s surface.

Unlike in 2011, when Rosetta was put into a 31-month hibernation for the most distant part of its journey, this time it is riding alongside the comet. Comet 67P/Churyumov-Gerasimenko’s maximum distance from the Sun (over 850 million km) is more than Rosetta has ever journeyed before. The result is that there is not enough power at its most distant point to guarantee that Rosetta’s heaters would be able to keep it warm enough to survive.

Instead of risking a much longer hibernation that is unlikely to be survivable, and after consultation with Rosetta’s science team in 2014, it was decided that Rosetta would follow its lander Philae down onto the comet. The final hours of descent will enable Rosetta to make many once-in-a-lifetime measurements, including very-high-resolution imaging, boosting Rosetta’s science return with precious close-up data achievable only through such a unique conclusion. Communications will cease, however, once the orbiter reaches the surface, and its operations will then end.

The decision to end the mission this way makes great sense. I only question their decision to purposely end all communications upon impact. Though it is likely that communications will be lost anyway, wouldn’t it be better to try to get data back, like the scientists did with the American NEAR spacecraft when it touched down on the asteroid Eros at the end of its mission?

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Sierra Nevada signs deal with UN

9:29 am

The competition heats up: Sierra Nevada has signed a memorandum of understanding with the United Nations, creating the framework for UN member nations to use its Dream Chaser cargo vehicle for science research.

Under the agreement, [Sierra Nevada] committed to dedicating one or more Dream Chaser missions that will host payloads from member countries. The cooperation will focus on developing an interface control document and payload hosting guide to allow payloads developed by participating countries, especially non-space-faring ones, to be flown into orbit.

What this means is that American space technology, developed and owned privately rather than built by NASA, is beginning to grab business wherever it can find it. These UN space missions eventually flown on Dream Chaser might be foreign built, but it will be the American spacecraft that gets them to space..Sierra Nevada will not only make money doing so, it will position itself financially to develop even better space products that it can sell worldwide. Nor will Sierra Nevada be alone in this. The result will be the increasing prosperity of the American aerospace industry as it gains a larger share in the settlement of the solar system.

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Blue Origin breaks ground on rocket factory

9:16 am

The competition heats up: Blue Origin has broken ground on a Florida factory for building its orbital rockets.

At 750,000 square feet, the new custom-built facility is designed to be large enough to accommodate manufacturing, processing, integration, and testing of orbital rockets. To put that size in perspective, SpaceX’s rocket facility in Hawthorne, California is nearly one million square feet. Bezos stated that the entire rocket would be manufactured in this facility with the exception of the rocket engines themselves.

What this means is that Bezos is satisfied with the results of the test flights of his suborbital New Shepard spacecraft, and is now ready to upscale to a orbital rocket that would compete with SpaceX and everyone else in the increasingly competitive launch market.

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Russia looks to develop reusable first stage

9:13 am

The competition heats up: Russia’s space agency Roscosmos has reactivated the design team for developing a reusable first stage with wings that would return to a runway like an airplane.

They have put in charge of the project the designer of Buran, their Soviet-era space shuttle, and are trying to reassemble his team for this work.

With Russia, proposals like this should only be taken seriously when they actually start test flights.Too often the Russian government,.like NASA here, announces big plans, but fails to figure out how to build anything at a cost anyone can afford.

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Geologists discover giant field of underground helium in Tanzania

2:53 pm

Geologists have discovered a gigantic new field of underground helium gas, located in Tanzania’s Rift Valley.

Researchers figure there’s about 54 billion cubic feet of helium in just one section of the valley. To put that in context, the Federal Helium Reserve in Texas, which supplies more than 40% of domestic helium needs and contains about 30% of the world’s total helium supply, right now holds about 24.2 billion cubic feet, per Live Science.

The discovery is also important in that it wasn’t an accident. The geologists located the helium based on their theories of where they should find it.

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NASA approves robot satellite refueling mission

10:12 pm

The competition heats up: NASA has approved plans to launch Restore-L, a robot mission in 2020 to refuel a satellite.

In May, NASA officially moved forward with plans to execute the ambitious, technology-rich Restore-L mission, an endeavor to launch a robotic spacecraft in 2020 to refuel a live satellite. The mission – the first of its kind in low-Earth orbit – will demonstrate that a carefully curated suite of satellite-servicing technologies are fully operational. The current candidate client for this venture is Landsat 7, a government-owned satellite in low-Earth orbit.

This mission is being spear-headed by the division at the Goddard Space Flight Center that ran the repair missions to the Hubble Space Telescope, as well as the recent robotic refueling demonstrations on ISS. With the success of those demonstrations, NASA has obviously decided to move forward with an actual flight.

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A Russian space station spun off from ISS?

10:06 pm

The competition heats up: Energia, Russia’s main contractor for building its part of ISS, has proposed a plan to separate the Russian modules from ISS, once they are finally launched, to create a new and solely Russian space station.

According to RKK Energia, the prime Russian contractor on the ISS, the new outpost would begin with the separation of the Nauka [Russia’s ISS science module, long delayed] from the rest of the old station in mid-2020s. By that time, Nauka should have two even newer modules in tow. One would be the so-called Node Module, a tinker-toy-like component that could connect to six other modules, crew ships, cargo tankers, structural elements, you name it. The Node Module is already in RKK Energia’s garage and ready to go within a few months after the Nauka.

Next would be the new Science and Power Module (NEM) which, as it name implies, will finally give cosmonauts a state-of-the-art science lab and a pair of large solar arrays, making the Russian segment fully independent from the rest of the ISS in terms of power, communications, and other resources. The launch of NEM, currently promised as early as 2019, would set the stage for these three components to leave the ISS to form ROS.

Russia has always given itself the option to do this, designing its part of the station in a way that would allow it to stand alone.

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Juno closing in on Jupiter

10:52 am

Jupiter from Juno

On Friday the Juno science team released a new image of Jupiter taken by the spacecraft from about 6.8 million miles away.

The reduced resolution image on the right is cropped but with the colors enhanced to bring out the four Galilean moons, Ganymede, Callisto, Europa, and Io. The website notes that “Juno is approaching over Jupiter’s north pole, affording the spacecraft a unique perspective on the Jovian system. Previous missions that imaged Jupiter on approach saw the system from much lower latitudes, closer to the planet’s equator.”

Rendezvous and orbital insertion happens on July 4.

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Virgin Galactic gets another launch contract

9:22 am

The competition heats up: Virgin Galactic has signed a launch contract with new communications satellite company Sky and Space Global to use LauncherOne to put 200 nanosats into orbit in 2018.

This contract suggests that Virgin Galactic might be making good progress on LauncherOne. Or it might mean that Sky and Space has some commitments that forced it to pick Virgin Galactic over other smallsat launch companies that appear to be farther along in development. Either way, the stock market looked at this deal and, as noted in the article above, sold off enough Sky and Space stock for its value to drop.

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China launches first Long March 7 rocket, recovers test capsule

10:12 pm

The competition heats up: China successfully launched its first Long March 7 rocket on Saturday, the first launch also from its new Wencheng Spaceport.

According to this official Chinese report, the test capsule on the rocket also landed successfully and has been recovered.

Previously I had mistakenly reported that this launch would put into orbit China’s next test space station module. That launch is not until the fall.

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Getting and Installing Linux

6:01 am

After seeing the response to a number of my posts on the advantages of Linux (or anything) over Windows, one of my readers, James Stephens, offered to write a series of posts for Behind the Black, describing step-by-step the process by which one gets and installs Linux on a desktop or laptop computer. James is like almost every other user of Linux, self-taught and unafraid to play with the software. As he emailed me, “Over my long career I’ve had my hands in everything from vacuum tube televisions to sophisticated aerospace systems some of which are orbit today. I have designed and built recording studios, radio and television studios and serviced the equipment as well as the transmitters. But I must say I really enjoyed repairing televisions the most. I loved every aspect of the business and really enjoyed doing business with my customers.” At the present time James makes his living maintaining what he calls “a fleet of computers, Windows, Mac, and Linux.”

So, today we begin this series. If all goes as planned, James will be sending these to me on a weekly basis, whereby I will post them each Saturday. So, get one of your old unused computers out of the garage now and get ready to make it useful again, while simultaneously freeing yourself from Microsoft!

An Introduction

By James Stephens

Your phone your TV, most of the devices you use everyday use Linux. So too most of the world’s web sites including this one. So why not your PC? The purpose of this series, which we hope to post on a weekly basis every Saturday, is to at least in a general way acquaint you with desktop Linux and some of its advantages. More importantly, we hope to assist you with representative instructions for the installation and use of this most excellent computer operating system.

But first a few words of explanation.
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Russia looks to reduce Proton launch costs

10:36 am

The competition heats up: Russian officials are considering developing a new variant of the Proton rocket that would cost less to launch and thus make the rocket more desirable in the increasingly competitive launch market.

They have not made a decision yet. As the article notes,

[G]iven the extended length of time required for even less radical upgrades of Proton and the official Russian strategy to phase out the vehicle in favor of Angara-5, it is unclear whether it would be possible to justify the Proton-Light development effort. A number of previous proposals to change the shape and size of the Proton-M rocket were deemed too expensive more than a decade earlier in the rocket’s operational career.

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Saturn from Cassini

10:40 am

Saturn's rings

Cool image time! The image on the right, reduced in resolution to post here, shows how, because of the seasonal tilt of Saturn, the shadow of its rings is now cover much of the gas giant’s southern hemisphere.

When NASA’s Cassini spacecraft arrived at Saturn 12 years ago, the shadows of the rings lay far to the north on the planet. As the mission progressed and seasons turned on the slow-orbiting giant, equinox arrived and the shadows of the rings became a thin line at the equator. This view looks toward the sunlit side of the rings from about 16 degrees above the ring plane. The image was taken in red light with the Cassini spacecraft wide-angle camera on March 19, 2016.

We will continue to get from Cassini increasingly beautiful images of Saturn and its rings as the spacecraft positions itself better for its final flight down into the planet’s atmosphere.

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SpaceX’s first stage teaches them how to land on Mars

9:56 am

The competition heats up: This update on the status of SpaceX’s manned Dragon capsule also provides this interesting detail about the engineering knowledge gained from the company’s effort to vertically land its Falcon 9 first stages:

The company is also using the propulsive landings as a way to practically and physically test landing systems in a near-Mars atmospheric environment. “Earth’s upper atmosphere is also a really good analogue for Mars’ atmosphere,” noted [Garrett Reisman, Director of Space Operations]. “When you get up high enough, the density and consistency of the atmosphere is very similar to what you face during Entry, Descent, and Landing (EDL) on Mars. So every time we land, we take one of these rockets and we perform hypersonic retrograde propulsion, the data from which we’re sharing with JPL because it’s the first time this has ever been demonstrated on a major scale.”

To this end, Reisman pointed out that the Falcon 9 first stage landings are really serving as test beds for the EDL systems of eventual Mars missions. “Every time you see one of those rockets coming back, not only is it enabling a whole new paradigm for launching things into space, but it’s also bringing us one step closer to Mars.

As for Dragon, it now appears the company wants to do a full unmanned demo flight to and from ISS before it performs its launch abort test. They will then follow this with a manned demo mission to ISS. All three flights are planned for 2017.

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Sierra Nevada prepares for Dream Chaser glide tests

9:46 am

The competition heats up: Sierra Nevada now expects to deliver its refurbished engineering test prototype of Dream Chaser to NASA for new glide tests in August.

“Our version of the shuttle Enterprise is about to be finished for its next phase of flight tests,” [said Mark Sirangelo, corporate vice president.] “Somewhere in the August time frame, it’s going to be shipped off to California, to the Armstrong [Flight Research] Center and to Edwards to be in Phase 2 of flight testing, which is going to be really fun and exciting.”

Sirangelo said lessons learned from the atmospheric flight tests will be applied to the development of the orbital test vehicle, which is now being outfitted in Colorado. That test vehicle, in turn, will blaze the trail for the spacecraft that will carry cargo for NASA under the CRS-2 contract. “We are looking to be launching on time, which is about three years from now, in the second half of 2019,” Sirangelo said.

They get this cargo version flying successfully, and they will certainly get a contract to build a manned version.

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