Tag: engineering
3D printing
“We’re building spacecraft, not bizjets.”
The real future: “We’re building spacecraft, not bizjets.”
The real future: “We’re building spacecraft, not bizjets.”
The space shuttle docks with ISS, for the last time
The space shuttle docks with ISS, for the last time.
The space shuttle docks with ISS, for the last time.
The last space shuttle has reached orbit
After a very short hold at 31 seconds, the space shuttle Atlantis has launched and reached orbit without any obvious hitches.
After a very short hold at 31 seconds, the space shuttle Atlantis has launched and reached orbit without any obvious hitches.
Highest Water in a Decade Expected at Lake Powell
The highest water level in a decade is expected at Lake Powell by August.
Lake Powell’s rising water level is a result of the long and wet winter this year. An above-average snowpack, with late snows and unseasonably cold weather has lead to a slower melt than usual. As of May, the snowpack that feeds Lake Powell was 30 percent higher than average, with only 50 percent of the accumulated snowpack melted. [emphasis mine]
I thought Al Gore told us this wasn’t going to happen anymore.
The highest water level in a decade is expected at Lake Powell by August.
Lake Powell’s rising water level is a result of the long and wet winter this year. An above-average snowpack, with late snows and unseasonably cold weather has lead to a slower melt than usual. As of May, the snowpack that feeds Lake Powell was 30 percent higher than average, with only 50 percent of the accumulated snowpack melted. [emphasis mine]
I thought Al Gore told us this wasn’t going to happen anymore.
A new image of Vesta from Dawn
Dawn continues to approach the large asteroid Vesta. Below is an image taken July 1st from about 62,000 miles. The image has a resolution of 5.8 miles per pixel.
Despite Vesta’s large size, 330 miles in diameter, it is nonspherical. This fact, combined with data that says it is differentiated with a core and mantle, suggests that it is the remains of a larger object that subsequently broke up.
Dawn continues to approach the large asteroid Vesta. Below is an image taken July 1st from about 62,000 miles. The image has a resolution of 5.8 miles per pixel.
Despite Vesta’s large size, 330 miles in diameter, it is nonspherical. This fact, combined with data that says it is differentiated with a core and mantle, suggests that it is the remains of a larger object that subsequently broke up.
The billion pixel camera of Gaia
Private company hires former NASA engineers and astronauts
The transition to private space: Sierra Nevada hires former NASA engineers and astronauts.
The transition to private space: Sierra Nevada hires former NASA engineers and astronauts.
Why some space junk is impossible to track
This ISS status update, dated June 28, explains why the piece of space junk that flew past the station that day was such a surprise. (Hat tip to NASA engineer James Fincannon for pointing this out to me.)
Last night at ~6:00pm EDT, NASA Houston FTC (Flight Control Team) received notification of an upcoming “red threshold” conjunction of the ISS with a piece of orbital debris (Object 82618, UNKNOWN), with a TCA (Time of Closest Approach) this morning at 8:08am EDT, – which was too late to begin planning for a DAM (Debris Avoidance Maneuver). Therefore, FTC and crew made preparations for crew sheltering in Soyuz 26S & 27S. PC (Probability of Collision) at last tracking fix (7:20am) remained in the Red box, at ~0.003, with a miss distance of 0.25 km radial, 0.375 km downtrack, 0.570 m crosstrack. The necessary reconfiguration procedures (USOS hatches closed, etc.) began 1.5 hrs before TCA (6:38am EDT), and the six crewmembers ingressed their Soyuz vehicles. At 8:08am the object cleared the ISS with no impact, and shortly thereafter the crew was given the Go for returning to the ISS. [The late notification occurred because of the high air resistance (drag) of the object (~175 times higher than ISS) which made its trajectory very sensitive to small errors in atmospheric density predictions at the current solar flux. Due to the high drag, there is no chance of a recurrence of Object 82618).] [emphasis mine]
In other words, the piece of junk was probably something like a piece of insulation, very light but with a large area, much like a sail. Thus, as it flies through the thin atmosphere at 200 to 400 miles altitude its velocity and direction can easily change, making it difficult, if not impossible, to predict its future trajectory.
The good news is that these same conditions mean that the orbit of the object will quickly decay (“due to high drag”) so that it poses no future threat to the station.
Unfortunately, there are many other objects like this in orbit, and they all pose a threat, mostly because of the difficulty of reliably predicting their orbits.
Auto companies condemn 15% ethanol, say using it will void warranties
A dozen auto companies have condemned the 15% ethanol gasoline being pushed by Obama and corn-state politicians, saying its use will void their warranties.
A dozen auto companies have condemned the 15% ethanol gasoline being pushed by Obama and corn-state politicians, saying its use will void their warranties.
Serious coolant leak puts the Subaru Telescope out of commission
A serious coolant leak has put the Subaru Telescope in Hawaii out of commission.
A serious coolant leak has put the Subaru Telescope in Hawaii out of commission.
The launch of China’s first space station module is set for September
The launch of China’s first space station module is now set for September.
The launch of China’s first space station module is now set for September.
Hubble Makes its One Millionth Science Observation
Prime real estate
Since the 1990s, scientists have suspected that water-ice might be hidden in the forever-dark floors of the polar craters on the Moon. If so, these locations become valuable real estate, as they not only would provide future settlers water for drinking, the water itself can be processed to provide oxygen and fuel.
Moreover, the high points near these craters, including the crater rims, are hoped to be high enough so that the sun would never set or be blocked by other mountains as it made its circuit low along the horizon each day. If such a place existed, solar panels could be mounted there to generate electricity continuously, even during the long 14-day lunar night.
Below the fold is a six minute video, produced from images taken by Lunar Reconnaissance Orbiter (LRO) from February 6, 2010 to February 6, 2011, in an effort to find out if such a place actually exists. It shows how the sunlight hits the south pole across an entire year.
» Read more
Questions raised about the safety of China’s new bridge
Questions have been raised about the safety of China’s new bridge.
[China Central Television] said that workers were tightening bolts that could easily have been loosened by hand on the bridge, which has seen nearly 18,000 cars cross it every day since it was officially opened on June 30, on the eve of the 90th anniversary of the founding of the Communist Party of China.
Why does this remind me of the two shuttle accidents, where managers ignored engineering issues in order to satisfy political concerns?
Questions have been raised about the safety of China’s new bridge.
[China Central Television] said that workers were tightening bolts that could easily have been loosened by hand on the bridge, which has seen nearly 18,000 cars cross it every day since it was officially opened on June 30, on the eve of the 90th anniversary of the founding of the Communist Party of China.
Why does this remind me of the two shuttle accidents, where managers ignored engineering issues in order to satisfy political concerns?
Former NASA administrator frets about future lack of leaders to run small planetary missions
A former NASA official frets about the future lack of scientists to lead small planetary missions.
A former NASA official frets about the future lack of scientists to lead small planetary missions.
Launch Complex 37B: Level by Level
A photo tour of Launch Complex 37B, level by level.
A photo tour of Launch Complex 37B, level by level.
Mining the moon for water and nuclear fuel
Mining the moon for water and fuel.
Texas-based Shackleton Energy Company has already begun operations aimed at mining the Moon within the next few years.
The company’s plans for mining and refining operations would involve melting the ice and purifying the water, converting the water into gaseous hydrogen and oxygen, and then condensing the gases into liquid hydrogen, liquid oxygen and hydrogen peroxide, all potential rocket fuels.
Shackleton CEO Dale Tietz says the water extracted would be used almost exclusively as rocket fuel to power operations both within Low Earth Orbit (LEO) – such as space tourism and the removal of space-debris – on the Moon, and further out into space. ‘We are a for-profit business enterprise moving forward, and so we are only going there really for one reason and that is to mine, prospect mine and harvest water for rocket propellant production,’ says Tietz.
Mining the moon for water and fuel.
Texas-based Shackleton Energy Company has already begun operations aimed at mining the Moon within the next few years. The company’s plans for mining and refining operations would involve melting the ice and purifying the water, converting the water into gaseous hydrogen and oxygen, and then condensing the gases into liquid hydrogen, liquid oxygen and hydrogen peroxide, all potential rocket fuels.
Shackleton CEO Dale Tietz says the water extracted would be used almost exclusively as rocket fuel to power operations both within Low Earth Orbit (LEO) – such as space tourism and the removal of space-debris – on the Moon, and further out into space. ‘We are a for-profit business enterprise moving forward, and so we are only going there really for one reason and that is to mine, prospect mine and harvest water for rocket propellant production,’ says Tietz.
Getting rare-earth elements from ocean floor mud
Getting rare-earth elements, needed for electronics, from ocean floor mud?
Getting rare-earth elements, needed for electronics, from ocean floor mud?
First ARTEMIS Spacecraft Successfully Enters Lunar Orbit
The first of two ARTEMIS spacecraft has successfully entered lunar orbit.
The first of two ARTEMIS spacecraft has successfully entered lunar orbit.
Dawn’s approach to Vesta continues
Dawn’s approach to Vesta continues.
Starting at the beginning of the approach phase on May 3, Dawn interrupted thrusting once a week to photograph Vesta against the background stars. These images help navigators determine exactly where the probe is relative to its target. This technique does not replace other means of navigation but rather supplements them. One of the principal methods of establishing the spacecraft’s trajectory relies on accurately timing how long it takes radio signals, traveling, as all readers know, at the universal limit of the speed of light, to make the round trip between Earth and Dawn. Another uses the Doppler shift of the radio waves, or the slight change in pitch caused by the craft’s motion. These sensitive measurements remain essential to navigating the faraway ship as it sails the interplanetary seas.
Despite the very slow approach, the distance is small enough now that observing Vesta weekly is no longer sufficient. To achieve the navigational accuracy required to reach the intended orbit in early August, last week the frequency of imaging was increased to twice per week. In each session, half of the pictures are taken with long exposures to ensure many stars are detectable, thus overexposing the much brighter disc of the nearby Vesta. The other half use short exposures to ensure that the rocky world shows up correctly so its precise location can be measured. The visible and infrared mapping spectrometer has been commanded to observe Vesta during three of these sessions, each time providing valuable information that will help scientists select instrument settings for when Dawn is close enough to begin its detailed scientific measurements.
Dawn’s approach to Vesta continues.
Starting at the beginning of the approach phase on May 3, Dawn interrupted thrusting once a week to photograph Vesta against the background stars. These images help navigators determine exactly where the probe is relative to its target. This technique does not replace other means of navigation but rather supplements them. One of the principal methods of establishing the spacecraft’s trajectory relies on accurately timing how long it takes radio signals, traveling, as all readers know, at the universal limit of the speed of light, to make the round trip between Earth and Dawn. Another uses the Doppler shift of the radio waves, or the slight change in pitch caused by the craft’s motion. These sensitive measurements remain essential to navigating the faraway ship as it sails the interplanetary seas.
Despite the very slow approach, the distance is small enough now that observing Vesta weekly is no longer sufficient. To achieve the navigational accuracy required to reach the intended orbit in early August, last week the frequency of imaging was increased to twice per week. In each session, half of the pictures are taken with long exposures to ensure many stars are detectable, thus overexposing the much brighter disc of the nearby Vesta. The other half use short exposures to ensure that the rocky world shows up correctly so its precise location can be measured. The visible and infrared mapping spectrometer has been commanded to observe Vesta during three of these sessions, each time providing valuable information that will help scientists select instrument settings for when Dawn is close enough to begin its detailed scientific measurements.
A look inside NASA’s “Skunk Works”
Internet Explorer continues to lose market share to Chrome, Firefox, others
Battle of the browsers: Internet Explorer continues to lose market share to Chrome, Firefox, and others.
Battle of the browsers: Internet Explorer continues to lose market share to Chrome, Firefox, and others.
NASA Foresees 2-Year Final Shuttle Retirement Phase
Seems a bit long to me: NASA foresees a two year period after the last shuttle lands to retire the program completely.
Seems a bit long to me: NASA foresees a two year period after the last shuttle lands to retire the program completely.
World’s longest sea bridge opens in China
The world’s longest sea bridge opened in China yesterday. With some cool images.
The world’s longest sea bridge opened in China yesterday. With some cool images.
The families of the Challenger astronauts come out in favor of commercial private manned spaceflight
The families of the Challenger astronauts come out in favor of commercial private manned spaceflight.
The families of the Challenger astronauts come out in favor of commercial private manned spaceflight.
Computer chess program stripped of its four titles and its programmer banned
A computer chess program has been stripped of its four titles and its programmer banned because of accusations of plagiarism.
A computer chess program has been stripped of its four titles and its programmer banned because of accusations of plagiarism.
LightSquared report shows widespread GPS interference
A report on the first tests of the LightSquared wireless service says that it will produce widespread interference to GPS systems, especially for aviation. LightSquared meanwhile has told the FCC the problem is the fault of the GPS industry.
A report on the first tests of the LightSquared wireless service says that it will produce widespread interference to GPS systems, especially for aviation. LightSquared meanwhile has told the FCC the problem is the fault of the GPS industry.
NJ legislature passes ban on fracking, while NY considers lifting its ban
Who wins? NJ legislature has passed a ban on fracking for natural gas, while NY has moved to lift its ban.
Who wins? NJ legislature has passed a ban on fracking for natural gas, while NY has moved to lift its ban.
Breathtaking view of the central peak of Tycho Crater
Another astonishing space photograph, this time from lunar orbit, taken by Lunar Reconnaissance Orbiter on June 11, 2011.
The image looks down at the central peak of Tycho crater, with enough detail to make out individual boulders at the summit. Go the link to see some closeups.
