Tag: astronomy
A telescope a square kilometer in size
Looking inside red giant stars
Messenger in orbit around Mercury
Above, an annotated version of the first orbital image, showing areas of the south pole never before seen.
From the press conference about the first Messenger images from Mercury orbit:
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Which near-Earth asteroids are ripe for a visit?
Which near-Earth asteroids are ripe for a visit?
Which near-Earth asteroids are ripe for a visit?
When is an Asteroid Not an Asteroid?
When is an asteroid not an asteroid?
The layered structure of Vesta (core, mantle and crust) is the key trait that makes Vesta more like planets such as Earth, Venus and Mars than the other asteroids, McCord said. Like the planets, Vesta had sufficient radioactive material inside when it coalesced, releasing heat that melted rock and enabled lighter layers to float to the outside. Scientists call this process differentiation.
This question immediately demonstrates once again the terrible mess the International Astronautical Union made when it decided several years ago to define what makes a planet, and came up with a definition that simply doesn’t work. For if Vesta should be considered a planet, why not Pluto?
When is an asteroid not an asteroid?
The layered structure of Vesta (core, mantle and crust) is the key trait that makes Vesta more like planets such as Earth, Venus and Mars than the other asteroids, McCord said. Like the planets, Vesta had sufficient radioactive material inside when it coalesced, releasing heat that melted rock and enabled lighter layers to float to the outside. Scientists call this process differentiation.
This question immediately demonstrates once again the terrible mess the International Astronautical Union made when it decided several years ago to define what makes a planet, and came up with a definition that simply doesn’t work. For if Vesta should be considered a planet, why not Pluto?
The first image from Mercury orbit
The first image from Mercury orbit.
The first image from Mercury orbit.
The brightest supernovae yet found
The brightest supernovae yet found.
Supernova 2008am is 3.7 billion light-years away. At its peak luminosity, it was over 100 billion times brighter than the Sun. It emitted enough energy in one second to satisfy the power needs of the United States for one million times longer than the universe has existed.
The brightest supernovae yet found.
Supernova 2008am is 3.7 billion light-years away. At its peak luminosity, it was over 100 billion times brighter than the Sun. It emitted enough energy in one second to satisfy the power needs of the United States for one million times longer than the universe has existed.
Quarter-mile diameter asteroid to pass only 200,000 miles from the Earth on November 8, 2011
Get those telescopes out! A asteroid, a quarter-mile in diameter, is going to pass only 200,000 miles from the Earth on November 8, 2011. Key quote:
Although classified as a potentially hazardous object, 2005 YU55 poses no threat of an Earth collision over at least the next 100 years. However, this will be the closest approach to date by an object this large that we know about in advance and an event of this type.
Get those telescopes out! A asteroid, a quarter-mile in diameter, is going to pass only 200,000 miles from the Earth on November 8, 2011. Key quote:
Although classified as a potentially hazardous object, 2005 YU55 poses no threat of an Earth collision over at least the next 100 years. However, this will be the closest approach to date by an object this large that we know about in advance and an event of this type.
X-ray stripes in the expanding remnant of a supernova explosion
X-ray stripes in the expanding remnant of a supernova explosion.
X-ray stripes in the expanding remnant of a supernova explosion.
Mining and jobs versus radio astronomy
Mining and jobs versus radio astronomy.
Mining and jobs versus radio astronomy.
Dawn Opens its Eyes, Checks its Instruments
All systems go! Dawn did a camera and instrument checkout last week, in preparation for its summertime arrival at the asteroid Vesta.
All systems go! Dawn did a camera and instrument checkout last week, in preparation for its summertime arrival at the asteroid Vesta.
Two stars caught fusing into one
Two stars fusing into one.
Two stars fusing into one.
European Space Missions to Go It Alone After NASA Yanks Support
The mess from the NASA space war spreads: Three European space science missions are now on their own after the U.S. the space agency pulls funding.
The mess from the NASA space war spreads: Three European space science missions are now on their own after the U.S. the space agency pulls funding.
Quake moved Japan coast 8 feet; shifted Earth’s axis
The earthquake moved Japan’s coast eight feet while shifting the Earth’s axis about four inches.
The earthquake moved Japan’s coast eight feet while shifting the Earth’s axis about four inches.
No, the “supermoon” didn’t cause the Japanese earthquake
No, the “supermoon” didn’t cause the Japanese earthquake.
No, the “supermoon” didn’t cause the Japanese earthquake.
David Lanz & Paul Speer – Ode to a Dark Star
An evening pause: The music is beautiful, but the images tell us how far astronomy has changed our perception of the universe in the last few decades.
An image of Apophis
Astronomers from the University of Hawaii have taken new images of the potentially dangerous asteroid Apophis in an effort to refine their understanding of its orbital path.
Astronomers from the University of Hawaii have taken new images of the potentially dangerous asteroid Apophis in an effort to refine their understanding of its orbital path.
Mature galaxy cluster found in young universe
A mature galaxy cluster has been found by astronomers at a time when the universe is thought to be only a quarter of its present age.
This discovery could be very significant, since astronomers think mature galaxy clusters need time to form, and shouldn’t exist in the early universe. “If further observations find many more [of these clusters] then this may mean that our understanding of the early Universe needs to be revised.”
A mature galaxy cluster has been found by astronomers at a time when the universe is thought to be only a quarter of its present age.
This discovery could be very significant, since astronomers think mature galaxy clusters need time to form, and shouldn’t exist in the early universe. “If further observations find many more [of these clusters] then this may mean that our understanding of the early Universe needs to be revised.”
The elongated craters of Mars
More press release journalism,
this time about sunspots
Did you hear the news? Scientists have solved the mystery of the missing sunspots!
You didn’t? Well, here’s some headlines and stories that surely prove it:
- From Space.com: Mysterious Case of Missing Sunspots Solved.
- From Reuters: Scientists solve mystery of disappearing sunspots.
- From the Deccan Herald: NASA, India sponsored research explains missing sunspots.
- From Wired: Study Blames Plasma Flow for Spotless Sun.
- From NASA: Researchers Crack the Mystery of the Missing Sunspots.
- From Montana State University: MSU team solves mystery of missing sunspots, helps predict space weather.
- From Harvard-Smithsonian Center for Astrophysics: Solar Mystery Solved.
The trouble is that every one of these headlines is 100 percent wrong. The research, based on computer models, only found that when the plasma flow from the equator to the poles beneath the Sun’s surface slows down, the number of sunspots declines.
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Images of an exoplanet
The sponge-like Saturn moon
The sponge-like Saturn moon. Key quote:
Hyperion measures about 250kms across; it rotates chaotically and has a density so low that it might house a vast system of caverns inside.
The sponge-like Saturn moon. Key quote:
Hyperion measures about 250kms across; it rotates chaotically and has a density so low that it might house a vast system of caverns inside.
Leif J. Robinson, Editor in Chief of Sky & Telescope magazine for 20 years, passed away Sunday
R.I.P. Leif J. Robinson, who served as editor of Sky & Telescope for twenty years, passed away Sunday at the age of 71 at his home in Costa Rica.
R.I.P. Leif J. Robinson, who served as editor of Sky & Telescope for twenty years, passed away Sunday at the age of 71 at his home in Costa Rica.
Amateur images of ISS and the shuttle
Take a gander at this spectacular image of the shuttle approaching ISS, taken by an amateur astronomer from the ground!
Take a gander at this spectacular image of the shuttle approaching ISS, taken by an amateur astronomer from the ground!
Detector Array Deterioration Poses New Problem for JWST
More problems for the James Webb Space Telescope: The detector arrays for several instruments are deteriorating, even as they sit on the shelf. And remember, the 2014 launch date is probably going to be delayed until 2016. Key quote:
“As you get further and further out with [the launch date], it really raises questions about how far down the [integration and test] process you go for the instruments … and how long you have to store all that before you actually launch,” [Webb program director Rick Howard] told the NASA Advisory Council’s astrophysics subcommittee during a Feb. 16 public meeting here. “And that just makes everybody even more nervous about this problem than anything else.”
More problems for the James Webb Space Telescope: The detector arrays for several instruments are deteriorating, even as they sit on the shelf. And remember, the 2014 launch date is probably going to be delayed until 2016. Key quote:
“As you get further and further out with [the launch date], it really raises questions about how far down the [integration and test] process you go for the instruments … and how long you have to store all that before you actually launch,” [Webb program director Rick Howard] told the NASA Advisory Council’s astrophysics subcommittee during a Feb. 16 public meeting here. “And that just makes everybody even more nervous about this problem than anything else.”
Pan-Starrs Telescope discovers 19 near-earth asteroids in one night
A new record! On January 19, the Pan-Starrs telescope in Hawaii discovered 19 near-earth asteroids, the most for a single night of asteroid-hunting by anyone.
A new record! On January 19, the Pan-Starrs telescope in Hawaii discovered 19 near-earth asteroids, the most for a single night of asteroid-hunting by anyone.
Does dark energy and dark matter exist, or is it our theories of gravity?
The uncertainty of science: New evidence suggests that rather than postulate the existence of dark energy and dark matter, scientists need simply to revise their theories of gravity.
The uncertainty of science: New evidence suggests that rather than postulate the existence of dark energy and dark matter, scientists need simply to revise their theories of gravity.
Gliese 581g: Alive or Dead?
The uncertainty of science: The discoverers of the possibly habitable exoplanet Gliese 581g defend their work against recent science attacks.
The uncertainty of science: The discoverers of the possibly habitable exoplanet Gliese 581g defend their work against recent science attacks.
More Webb budget troubles
According to its manager, the budget troubles of the James Webb Space Telescope will likely keep it on the ground until 2016.
This is terrible news for space-based astrophysics. Until Webb gets launched, NASA will have no money for any other space telescope project. And since all the space telescopes presently in orbit are not expected to be operating at the end of the decade, by 2020 the U.S. space astronomy program will essentially be dead.
Then again, there is the private sector, as Google Lunar X Prize is demonstrating.
According to its manager, the budget troubles of the James Webb Space Telescope will likely keep it on the ground until 2016.
This is terrible news for space-based astrophysics. Until Webb gets launched, NASA will have no money for any other space telescope project. And since all the space telescopes presently in orbit are not expected to be operating at the end of the decade, by 2020 the U.S. space astronomy program will essentially be dead.
Then again, there is the private sector, as Google Lunar X Prize is demonstrating.
Stardust images of comet locate crater from Deep Impact’s impact
More news from Stardust: scientists have now identified what they think is the crater produced by Deep Impact’s impact in 2005. Key quote:
The images revealed a 150-metre-wide crater at the Deep Impact collision point that was not present in 2005. The crater is a subtle feature in the images, but it appears consistently in multiple views from the spacecraft. “So I feel very confident that we did find the [impact] site,” said mission member Peter Schultz of Brown University in Providence, Rhode Island, at a press briefing on Tuesday. The crater’s features are “subdued” rather than sharply defined, like those of craters made in hard materials like rock. “The message is: This surface of the comet where we hit is very weak,” said Schultz. The crater also has a small mound in its middle, indicating that some of the material thrown up by the impact was drawn by the comet’s gravity back down into the crater, he said: “In a way, it partly buried itself.”
More news from Stardust: scientists have now identified what they think is the crater produced by Deep Impact’s impact in 2005. Key quote:
The images revealed a 150-metre-wide crater at the Deep Impact collision point that was not present in 2005. The crater is a subtle feature in the images, but it appears consistently in multiple views from the spacecraft. “So I feel very confident that we did find the [impact] site,” said mission member Peter Schultz of Brown University in Providence, Rhode Island, at a press briefing on Tuesday. The crater’s features are “subdued” rather than sharply defined, like those of craters made in hard materials like rock. “The message is: This surface of the comet where we hit is very weak,” said Schultz. The crater also has a small mound in its middle, indicating that some of the material thrown up by the impact was drawn by the comet’s gravity back down into the crater, he said: “In a way, it partly buried itself.”