Preparing for Hurricane Irene
If you are on the east coast, this post is for you: Preparing for Hurricane Irene.
If you are on the east coast, this post is for you: Preparing for Hurricane Irene.
Tag: engineering
Preparing for Hurricane Irene
When dust, pebbles, rocks, and boulders act like liquid
The science team of Lunar Reconnaissance Orbiter released an intriguing picture yesterday of what scientists call a granular flow down the side of a five mile wide crater on the far side of the moon. Looking at the image, one would swear that the darker material flowing down the slope of the crater rim is a lava flow frozen in place.
However, according to the scientists, that is not what it is. Instead, this is merely debris left behind from an avalanche.
» Read more
Divers have recovered the telegraph and some of the steering equipment from the Lusitania, a liner sunk off Ireland by a German submarine in 1915.
Divers have recovered the telegraph and some of the steering equipment from the Lusitania.
Divers have recovered the telegraph and some of the steering equipment from the Lusitania.
Capturing an asteroid into Earth orbit
Want to mine an asteroid? Rather than travel to it with all their mining equipment, three Chinese scientists have proposed a better way. In a paper published today on the Los Alamos astro-ph preprint website, they have calculated the energy required to shift the orbits of the six thousand near-Earth asteroids and place them in Earth orbit for later mining. Of these, they found 46 asteroids that had the potential for such an operation, and two likely candidates for a space mission. One 30-foot-wide asteroid, 2008EA9, will actually be in the right place for this technique in 2049. As they write,
It can be seen that the velocity increment of the 2008EA9 is relatively small (-1.00km/s) and it will very close approach [approximately 645,000 miles] to the Earth in [February] 2049. Moreover the size of the NEO 2008EA9 is very small so that the capturing of it is relatively easy.
The real problem, of course, is adding that small “velocity increment” to the asteroid.
» Read more
Progress freighter launch fails
The launch of a Progress freighter to ISS today has failed, with the freighter ending up crashing into Siberia.
This is very bad news for the station. Everyone in the space industry knows that with the shuttle gone, it will be a challenge to maintain supplies to the station’s the six-person crew. Losing just one supply ship will strain the station’s supplies, if not now in the long run for sure.
Worse, this is the first launch failure of the Soyuz rocket that puts both Progress and manned Soyuz capsule into orbit in more than eleven years. The next manned crew is scheduled for launch on September 21. Whether this failure will delay that launch remains unknown.
The launch of a Progress freighter to ISS today has failed, with the freighter ending up crashing into Siberia.
This is very bad news for the station. Everyone in the space industry knows that with the shuttle gone, it will be a challenge to maintain supplies to the station’s the six-person crew. Losing just one supply ship will strain the station’s supplies, if not now in the long run for sure.
Worse, this is the first launch failure of the Soyuz rocket that puts both Progress and manned Soyuz capsule into orbit in more than eleven years. The next manned crew is scheduled for launch on September 21. Whether this failure will delay that launch remains unknown.
NASA’s costs estimates too low for Congress’s heavy-lift rocket
Surprise, surprise! An independent analysis of NASA’s budget estimates to build Congress’s heavy-lift rocket, the program-formerly-called-Constellation, are untrustworthy and likely low.
“All three program estimates assume large, unsubstantiated, future cost efficiencies leading to the impression that they are optimistic,” the team said in its key findings. A risk assessment revealed the funding reserves projected for all three programs are insufficient, according to Booz Allen Hamilton. NASA has not disclosed its internal cost estimate for the Space Launch System. “Due to procurement of items still in development and large cost risks in the out years, NASA cannot have full confidence in the estimates for long-term planning,” the executive summary said.
This project is nothing more than Congressional pork. It will never get built. Sadly, it might waste a lot of money before it never gets built.
Surprise, surprise! An independent analysis of NASA’s budget estimates to build Congress’s heavy-lift rocket, the program-formerly-called-Constellation, are untrustworthy and likely low.
“All three program estimates assume large, unsubstantiated, future cost efficiencies leading to the impression that they are optimistic,” the team said in its key findings. A risk assessment revealed the funding reserves projected for all three programs are insufficient, according to Booz Allen Hamilton. NASA has not disclosed its internal cost estimate for the Space Launch System. “Due to procurement of items still in development and large cost risks in the out years, NASA cannot have full confidence in the estimates for long-term planning,” the executive summary said.
This project is nothing more than Congressional pork. It will never get built. Sadly, it might waste a lot of money before it never gets built.
Buses vs high speed trains: the buses win
Buses vs high speed trains: the buses win.
Buses vs high speed trains: the buses win.
Blue Origin to do a test flight tomorrow
Blue Origin, one of the four commercial companies NASA hopes to use to get crew up and down from ISS, plans to do a test flight tomorrow. Hat tip to SpaceRef.
This company, founded by Jeff Bezos of amazon.com, has generally released very little information about their effort.
Blue Origin, one of the four commercial companies NASA hopes to use to get crew up and down from ISS, plans to do a test flight tomorrow. Hat tip to SpaceRef.
This company, founded by Jeff Bezos of amazon.com, has generally released very little information about their effort.
Bigelow in negotiations to supply privately-built modules to ISS
Bigelow Aerospace is in negotiations with both NASA and Japan to supply ISS with privately-built modules
The module could be rented out as an ISS storage unit, making the station less dependent on frequent resupply flights, says Hiroshi Kikuchi of JAMSS. To show that the modules are capable of safe, crewed operation, Bigelow is also negotiating with NASA to attach one to a US-owned ISS module.
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Bigelow Aerospace is in negotiations with both NASA and Japan to supply ISS with privately-built modules
The module could be rented out as an ISS storage unit, making the station less dependent on frequent resupply flights, says Hiroshi Kikuchi of JAMSS. To show that the modules are capable of safe, crewed operation, Bigelow is also negotiating with NASA to attach one to a US-owned ISS module.
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Craters, craters, everywhere
Below the fold are two images released today, one from Dawn at Vesta and the other from Messenger at Mercury. What makes them interesting to me is that, though the surfaces of both Vesta and Mercury are crater-packed, there are definitely distinct differences between them that one can spot if you look closely, all highlighting the fundamentally different environments of both worlds.
First, the Vesta photograph. The image looks out past the asteroid’s horizon, showing clearly that this dwarf planet is not spherical, with the south pole depression that puzzles scientists just on the planet’s limb. The parallel long deep grooves that are associated with this depression can be seen on the right. Notice also that the inside walls of all the craters slope downward in a very shallow manner. This gives the impression that the impacts that formed these craters smashed into an almost beachlike sandy surface. Note too the that the center of some craters have what appear to be flat small “ponds,” a phenomenon seen by the spacecraft NEAR when it orbited the asteroid Eros. These ponds are not liquid, but are actually made up of fine-grained particles that settle in the hollows of the asteroid.
» Read more
NASA announces awards for three technology demonstration space missions
NASA has announced three awards for technology demonstration space missions, all set to fly within four years. More details here.
The three missions are:
- A solar sail demonstration mission, flying a sail 38 by 38 meter sail.
- A demonstration of in-space laser/optical communications technologies.
- The use of a high-precision atomic clock in space.
I especially like the solar sail mission because of its long range possibilities, though the other technologies would probably be put to practical use more quickly.
NASA has announced three awards for technology demonstration space missions, all set to fly within four years. More details here.
The three missions are:
- A solar sail demonstration mission, flying a sail 38 by 38 meter sail.
- A demonstration of in-space laser/optical communications technologies.
- The use of a high-precision atomic clock in space.
I especially like the solar sail mission because of its long range possibilities, though the other technologies would probably be put to practical use more quickly.
Bringing the Delta 2 back to launch unmanned science probes
Rocket shortage: NASA is reconsidering the Delta 2 rocket as a vehicle to launch its unmanned science satellites.
Rocket shortage: NASA is reconsidering the Delta 2 rocket as a vehicle to launch its unmanned science satellites.
The new commercial space companies question NASA contracting policies
The new commercial space companies are challenging NASA’s new contracting policy.
The article covers the conflict that I described in this post, whereby NASA is abandoning the more flexible contracting approach used for the commercial cargo contracts of SpaceX and Orbital Sciences and going instead with the contracting system it used for all past NASA subcontracts.
The article is errs badly when it calls the new contracting approach that NASA wants to use “non-traditional.” It is instead the way NASA has been doing things for decades, whereby the agency takes full control of everything and requires contractors to fill out so much paperwork that the costs double and triple.
The new commercial space companies are challenging NASA’s new contracting policy.
The article covers the conflict that I described in this post, whereby NASA is abandoning the more flexible contracting approach used for the commercial cargo contracts of SpaceX and Orbital Sciences and going instead with the contracting system it used for all past NASA subcontracts.
The article is errs badly when it calls the new contracting approach that NASA wants to use “non-traditional.” It is instead the way NASA has been doing things for decades, whereby the agency takes full control of everything and requires contractors to fill out so much paperwork that the costs double and triple.
Europe and Russia talk of joint manned mission to Mars
Europe and Russia talk of joint manned mission to Mars.
I’m not sure how seriously to take this story, though its implications are intriguing regardless. More than any other country, Russia knows how to build the kind of spaceship necessary for the journey. What Europe will contribute more than anything else would be money.
Europe and Russia talk of joint manned mission to Mars.
I’m not sure how seriously to take this story, though its implications are intriguing regardless. More than any other country, Russia knows how to build the kind of spaceship necessary for the journey. What Europe will contribute more than anything else would be money.
The real inventor of the telegraph
An evening pause: In honor of the 100th anniversary of the sending of the first round-the-world telegram on August 20, 1911, here is the story of the real inventor of the telegraph. And it ain’t what you think.
New images from Opportunity
Opportunity begins exploring the rim of Endeavour Crater, taking a bunch of new images . I especially like this one, of which I’ve posted a cropped scaled-down version below. The image looks across the 13-mile-wide Endeavour Crater to its far rim on the horizon. Note the haze. Mars very clearly has an atmosphere, even though it is far thinner than Earth’s. In the foreground are scattered rocks, ejecta produced from the impact that formed a smaller nearby crater now named Opportunity Crater.
Some results from the HTV-2 hypersonic flight
Some results from the HTV-2 hypersonic flight: the glider flew successfully for about three minutes at 20 times the speed of sound.
Fixed the stupid error. The speed of SOUND is of course correct. Sorry for the lapse in thought.
Some results from the HTV-2 hypersonic flight: the glider flew successfully for about three minutes at 20 times the speed of sound.
Fixed the stupid error. The speed of SOUND is of course correct. Sorry for the lapse in thought.
A Chinese launch failure today
Another rocket launch failure today, this time by the Chinese.
Another rocket launch failure today, this time by the Chinese.
Space Boat: A Nautical Mission to an Alien Sea
The Titan Mare Explorer: A nautical mission to an alien sea.
If [NASA] green-lights the mission, the capsule will lift off in 2016. By 2023, TiME will be about 800 million miles away in Titan’s north-polar region, home to its biggest lakes and seas. The capsule will take photographs, collect meteorological data, measure depth, and analyze samples. TiME will have no means of propulsion once it is on Titan, so it will float, carried by breezes across the sea’s surface. Then, by the mid-2020s, it will enter a decade-long winter of darkness as the moon’s orbit takes it to the dark side of Saturn, away from the sun and communication. It won’t have a line of sight to Earth to beam back more data until 2035.
The Titan Mare Explorer: A nautical mission to an alien sea.
If [NASA] green-lights the mission, the capsule will lift off in 2016. By 2023, TiME will be about 800 million miles away in Titan’s north-polar region, home to its biggest lakes and seas. The capsule will take photographs, collect meteorological data, measure depth, and analyze samples. TiME will have no means of propulsion once it is on Titan, so it will float, carried by breezes across the sea’s surface. Then, by the mid-2020s, it will enter a decade-long winter of darkness as the moon’s orbit takes it to the dark side of Saturn, away from the sun and communication. It won’t have a line of sight to Earth to beam back more data until 2035.
Using a solar sail to deflect an earth-destroying asteroid
In a paper published today on the Los Alamos astro-ph preprint website, two Chinese scientists have proposed using a solar sail for deflecting any asteroid that happens to be aimed at the earth. The diagram to the right is their simulated mission to impact the asteroid Apophis, which will pass close to the earth in 2029 and — depending on whether that flyby puts it through a very small 600 meter-wide mathematical “keyhole” — could then return in 2036 on a collision course.
The idea is to use the sail to slow the spacecraft down enough so that it starts to fall towards the sun. The sail is then used to maneuver it into a retrograde orbit. When it impacts the asteroid the impact will therefore be similar to a head-on collision, thereby imputing the most energy in the least amount of time with the least amount of rocket fuel. In their Apophis simulation, a mission, weighing only 10 kilograms (about 22 pounds), launched around 2025, and hitting the asteroid in this manner in 2026, would deflect its flyby in 2029 enough to guarantee it will not fly through the “keyhole” and therefore eliminate any chance of it hitting the earth in 2036.
Obviously many questions must be answered before such a mission should fly.
» Read more
Two stories about a possible tourist flight around the moon
Fly me to the moon! Two stories today (here and here) from Russia about a possible tourist flight around the moon by 2016-2017.
Fly me to the moon! Two stories today (here and here) from Russia about a possible tourist flight around the moon by 2016-2017.
American manned space: dependent on the Russians in more ways than you think
American manned space: dependent on the Russians in more ways than you think.
As commentators from around the country gnash their teeth at U.S. dependence upon Russia to move cargo and astronauts to the mostly U.S. built/funded International Space Station (ISS), they’ve missed the bigger boat: With one exception, all the commercial spaceflight offerings currently in the works have Soviet or Russian engines as a key part of the rockets involved.
American manned space: dependent on the Russians in more ways than you think.
As commentators from around the country gnash their teeth at U.S. dependence upon Russia to move cargo and astronauts to the mostly U.S. built/funded International Space Station (ISS), they’ve missed the bigger boat: With one exception, all the commercial spaceflight offerings currently in the works have Soviet or Russian engines as a key part of the rockets involved.
All systems go on Juno
Things are so good on Juno ten days after launch that mission controllers have canceled a rocket burn to adjust the spacecraft’s course.
Things are so good on Juno ten days after launch that mission controllers have canceled a rocket burn to adjust the spacecraft’s course.
Russians to display new rocket and manned spacecraft at international air show today
Russians to display a new rocket and manned spacecraft design at an international air show in Russia today.
Russians to display a new rocket and manned spacecraft design at an international air show in Russia today.
Saving a failed orbiting satellite with engineering
Saving a failed orbiting satellite with engineering.
Saving a failed orbiting satellite with engineering.
America’s first jet
A living room electon microscope
Thirty years ago IBM introduced its first pc
Another anniversary: Thirty years ago today IBM introduced its first PC.
Another anniversary: Thirty years ago today IBM introduced its first PC.
Some questions about today’s hypersonic test flight
Here are some additional stories describing today’s test flight of the Hypersonic Test Vehicle.
- Los Angeles Times: Falcon hypersonic vehicle test flight fails
- Aviation Week: Telemetry Lost During Hypersonic Test Flight
- DARPA: HTV-2 collects unique data during several phases of second flight
I have several questions, and no answers:
Contact quickly lost during third test flight of hypersonic plane
Contact was quickly lost today soon after a hypersonic glider was released by its rocket launcher during a test flight. More here.
Contact was quickly lost today soon after a hypersonic glider was released by its rocket launcher during a test flight. More here.