SpaceX seeks two more pads for returning 1st stages

The competition heats up: SpaceX is asking for permission to establish two more landing pads so that it will have the capability of landing three first stages all within minutes of each other.

“SpaceX expects to fly Falcon Heavy for the first time later this year,” the company said in a statement responding to questions. “We are also seeking regulatory approval to build two additional landing pads at Cape Canaveral Air Force Station. We hope to recover all three Falcon Heavy rockets, though initially we may attempt drone ship landings” at sea.

This news suggests two things: 1. The first Falcon Heavy launch is definitely coming soon. 2. They are going to try to return all three 1st stages during that first launch.

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100 Kepler exoplanet candidates confirmed

Worlds without end: Astronomers have confirmed another 100 of Kepler’s more than 3,000 candidate exoplanets.

One of the most interesting set of planets discovered in this study is a system of four potentially rocky planets, between 20 and 50 percent larger than Earth, orbiting a star less than half the size and with less light output than the Sun. Their orbital periods range from five-and-a-half to 24 days, and two of them may experience radiation levels from their star comparable to those on Earth.

Despite their tight orbits—closer than Mercury’s orbit around the sun—the possibility that life could arise on a planet around such a star cannot be ruled out, according to Crossfield.

Because the host star of this as well as many of these other confirmed exoplanets are red dwarf stars, the possibility of life is reduced because the star and its system is likely to have a less rich mix of elements compared to our yellow G-type Sun.

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New climate model works better, but doesn’t!

New climate model
Image from Junk Science. I indicated the pause

The uncertainty of science: Scientists have developed a new computer climate model that does a better job of predicting the actual climate, until you get to the pause in warming during the past 18 years. The graph on the right, from the paper, shows the model’s prediction compared to the raw data. The two line up perfectly, until around 1998, when the pause or hiatus in global warming began. From that point, the model fails.

I especially like this quote from the press release, made by one of the paper’s two authors:

“Most of the difference between the raw data and new estimates is found during the recent 18 years since 1998,” said Xie. “Because of the hiatus, the raw data underestimate the greenhouse warming.” [emphasis mine]

Note how he reverses things. For him, the raw data is wrong, as it underestimates their perfect model of human-caused greenhouse warming. In reality, it is their model that has failed, as it fails to predict the pause in warming, showing that it must be missing important factors that are influencing the climate. Or as physicist Richard Feynmann so cogently put it,

“It doesn’t matter how beautiful your theory is, it doesn’t matter how smart you are. If it doesn’t agree with experiment, it’s wrong.”

Note also that this research paper, released today, recognizes the pause, which shows again that the claims by some scientists that the pause did not exist have not been convincing to other climate scientists. This in turn once again illustrates the overall uncertainty of this field of science.

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The rings of Saturn

The rings of Saturn

Cool image time! The picture on right, cropped by me to show here, was taken by Cassini on April 2, 2016. You can see the moons Dione (on left) and Epimetheus (on right) above the rings. The full image can be seen here.

I am sure there is a lot of important science contained within this image. I post it here however not because of any scientific reason but entirely because it is simply damn spectacular. More than a decade after Cassini arrived at Saturn, every new picture of the planet’s giant ring system still seems incredibly unbelievable.

The universe is an amazing place, isn’t it?

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SpaceX chooses recovered first stage to reuse

The competition heats up: SpaceX has chosen as the first Falcon 9 first stage to reuse the one that was the first to land successfully on a barge on April 8.

Though they have not announced the mission it will fly, I strongly suspect it will be one of the two SES communications satellites scheduled to launch in the fall. SES has already said they want to buy a launch using a re-used first stage, and the two SES satellites scheduled for the fall have some redundancy between them.

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Getting and Installing Linux – Part 4

The Software Manager

by James Stephens

A computer is nothing more than a toy unless it has the tools you need to get your work done, and Linux has a great set of tools. Most distributions come loaded with the tools most people use every day, a full office suite, graphics and media packages and so on. If you want more, a world of software awaits at your fingertips via the Software Manager. Think of it as the app store for your distribution, with tens of thousands of official titles vetted and available for download, most free of charge. No longer are you left to the wilds of the Internet to find what you need.

Most Linux Software is functionally equivalent to that of Apple or Windows. Most open source titles are ported to all platforms including Linux. So if you use an open source title such as Audacity or VLC media player, just type its name into the Linux Software Manager search bar and you will find it. For propitiatory titles such as Photoshop just define what it does, image manipulation for example, and the Software Manager will suggest Linux equivalents like GIMP or KRITA. In addition Photoshop and some other Windows software run great on Linux using WINE – the Windows compatibility layer. More about that later.
» Read more

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A brief history of the nuclear defence triad

Link here.

The essay is a fascinating look at the origins in the 1950s of the U.S.’s defense triad of ground-launched ICBMs, submarine-launched ICBMS, and bombers. The section on the history of ICBMs describes nicely the roots of the Atlas 5 rocket as well as many of the federal government’s contracting policies for its big government projects like SLS.

You can’t just call up a new weapons system from nothing by sheer will alone. As [Thomas Hughes, in his history of Project Atlas] explains, there were severe doubts about how one might organize such a work. The first instinct of the military was to just order it up the way they would order up a new plane model. But the amount of revolutionary work was too great, and the scientists and advisors running the effort really feared that if you went to a big airplane company like Convair and said, “make me a rocket,” the odds that they’d actually be able to make it work were low. They also didn’t want to assign it to some new laboratory run by the government, which they felt would be unlikely to be able to handle the large-scale production issues. Instead, they sought a different approach: contract out individual “systems” of the missile (guidance, fuel, etc.), and have an overall contractor manage all of the systems. This took some serious effort to get the DOD and Air Force to accept, but in the end they went with it. [emphasis mine]

Sounds remarkable like the way the SLS rocket program is organized, with different contractors building different engines and stages and one contractor (Boeing) acting as top manager. More interestingly, the way the military used to do things — put out a request and let the private sector build it — is similar to the way NASA is doing things in today’s commercial cargo/manned program. What forced the transition from having the private sector design things to having the government entirely in charge? I have highlighted the key phrase, “the scientists and advisors running the effort.” They might have been sincere and they might even have been right, at the time, but nonetheless their approach was still a power grab, taking control of design and construction from the private sector and shifting it to them and the government entities building the rockets.

When construction actually started, the government ended up with six different rocket programs, Redstone, Atlas, Thor, Titan, Polaris, and Minuteman.

The redundancy was a hedge: the goal was to pick the top two of the programs and cancel the rest. Instead, Sputnik happened. In the resulting political environment, Eisenhower felt he had to put into production and deployment all six of them — even though some were demonstrably not as technically sound as others (Thor and Polaris, in their first incarnations, were fraught with major technical problems). This feeling that he was pushed by the times (and by Congress, and the services, and so on) towards an increasingly foolish level of weapons production is part of what is reflected in Eisenhower’s famous 1961 warning about the powerful force of the “military-industrial complex.”

Once again, this history illustrates the power grab that took place in Washington in the 1950s, something that Eisenhower did not like. Sixty years later, the rocket industry is struggling to transition back to the old way of doing things, because it actually works better. Before the 1950s, our innovative, competitive, and fast moving technological private sector made the United States an unbeatable powerhouse. Afterward, we increasingly lost the ability to innovate and compete, because the system created by these scientists and advisors did not encourage competition. Instead, they instituted a top-down centralized command approach, ironically quite similar to the Soviet model, the very philosophy the United States was opposing during the Cold War.

The failures of that top-down approach — illustrated starkly by SLS’s gigantic budget, interminable delays, and little produced — might finally be coming home to roost, allowing a new power grab by a competitive private sector. The change I think will be generally beneficial, not only to the needs of the federal government but to the needs of the general population, as it will generate a lot more wealth, a lot more innovation, and a lot more excitement, as it once again makes the U.S. a powerhouse, this time out among the planets.

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Want to get a close look at the Russian spaceport during a launch? You can!

The space tourism company that has partnered with the Russians to fly tourists to ISS is now offering a nine-day tour of Russia’s launch facilities, including watching a Soyuz manned launch for the bargain price of $14,495.

Guests will get to see the launch of the Soyuz spacecraft on its way to the International Space Station and experience the live Soyuz-International Space Station docking at Mission Control Center. “We will observe the early morning roll-out of the Soyuz Rocket and follow it to the launch pad site together with the press, military personnel, cosmonauts, and their relatives,” said MIR Corporation President Douglas Grimes. “The following day we will gather in a VIP seating gallery at Mission Control Center for the live satellite feed of the Soyuz docking.”

Guests also have the option to participate in cosmonaut training themselves: They can experience up to 4 Gs on the world’s largest centrifuge, take a parabolic zero-G simulation flight, don a spacesuit, and learn how to handle “typical space tasks.”

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SLS engine shuts down prematurely during test

A static firing test of one SLS’s rocket engines, repurposed from the shuttle, ended prematurely on Thursday.

It appears there was “a minor issue with the test stand” that caused the early shutdown. Some history about the engine itself:

The test involved development Engine 0528, back in the test stand at Stennis for its first test firing in seven years. E0528 was last fired from the nearby A-2 stand on July 1, 2009, in the second-to-last Space Shuttle Main Engine (SSME) ground test for the Shuttle program. Now out of storage and ready to fire again, the Aerojet Rocketdyne engine is being used in a second series of tests of the RS-25 configuration that will fly on SLS.

This is a test program, so having things go wrong is not necessarily a problem, as the failure teaches you things you need to know. However, they aren’t supposed to be testing the test stand, they are supposed to be testing the engine.

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