A galaxy with two central supermassive black holes
A galaxy with two central supermassive black holes.
A galaxy with two central supermassive black holes.
Tag: astronomy
A galaxy with two central supermassive black holes
Magnetic bubbles at the edge of the solar system
Magnetic bubbles at the edge of the solar system.
Magnetic bubbles at the edge of the solar system.
A press conference of my very own
This week the Space Telescope Science Institute in Baltimore, Maryland was holding a conference on the future research possibilities of the James Webb Space Telescope, and ended the conference with a writer’s workshop/press conference today.
Not surprisingly, there was not a lot of press interest. The Webb telescope is way behind schedule and over budget, and is not scheduled for launch until 2018. For most of the press, a press conference now on what Webb might someday do is really nothing more than a NASA sales pitch. Most reporters, including myself, don’t find these kinds of press conferences of much worth.
However, after thinking about it a bit, I decided to go, with the hope that I might be able to find out some more details about the state of the telescope’s construction.
To my astonishment, I discovered how little press interest there was, as it turned out I was the only journalist there! When the presentations ended, the whole workshop became an exercise in answering Bob Zimmerman’s questions about Webb and astronomy. I felt a bit embarrassed about this, but then decided the only stupid question is the one you don’t ask, and forged ahead. Moreover, the situation probably was far more embarrassing for the press people at the Institute then it was for me.
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The remnant of supernova 1987a Lights Up
The remnant of supernova 1987a lights up.
This supernova is the only naked eye supernova since the invention of the telescope, and has been tracked by Hubble for two decades.
The remnant of supernova 1987a lights up.
This supernova is the only naked eye supernova since the invention of the telescope, and has been tracked by Hubble for two decades.
When galaxies collide
An evening pause: a beautiful simulation of galaxy collision. Hat tip: Sky and Telescope.
Supernova flares in M51
A new supernova has erupted in the nearby galaxy M51, 23 million light years away.
A new supernova has erupted in the nearby galaxy M51, 23 million light years away.
Webb telescope disaster destroys NASA astrophysics budget
The James Webb Space Telescope: The disaster that destroyed NASA’s astrophysics program.
The James Webb Space Telescope: The disaster that destroyed NASA’s astrophysics program.
Dancing Telescopes
Planetary scientists push for Enceladus mission to search for alien life
Planetary scientists push for Enceladus mission to search for alien life.
Planetary scientists push for Enceladus mission to search for alien life.
Astronomical Deficit Forces Downsizing of U.S. Telescope Projects
Budget deficits signal a decline in spending for astronomy telescopes, both on the ground and in space, for the next decade.
Budget deficits signal a decline in spending for astronomy telescopes, both on the ground and in space, for the next decade.
The most distant explosion ever seen
The Spitzer photo atlas of galactic “train wrecks”
A photo atlas of galactic “train wrecks.”
A photo atlas of galactic “train wrecks.”
More on the new Kepler results: Lots of multiple planet systems
More on the new Kepler results: Lots of multiple planet systems.
More on the new Kepler results: Lots of multiple planet systems.
New results from Kepler
New results from Kepler.
New results from Kepler.
Want to go to an asteroid?
A paper published today on the Los Alamos astro-ph preprint website has taken a close look at identifying the best nearby asteroids ideal for mounting a manned mission. The conclusion: our survey of such asteroids is very incomplete (only 65 known), and due to their location in Earthlike orbits they are very difficult to study.
Ultra-low delta-v NEOs are not readily found. Their closely Earth-like orbits mean that most of the time they are in the daytime sky, as seen from the Earth, and so are effectively undetectable. As they approach within <1AU of the Earth they start to lie near quadrature, and so come into the dawn or dusk sky on Earth. The strong scattered sunlight background makes optical surveys toward the dawn or dusk much less sensitive and, in practice, surveys do not look in these directions, preferring to observe where the sky is dark, within 45 degrees, and at most 60 degrees, of the anti-Sun, opposition, direction. As a consequence the lowest delta-v NEOs are undercounted by current surveys, and the factor by which they are undercounted is not yet known.
The paper proposes building a dedicated unmanned infrared mission and placing it in a Venus-like orbit where it would be better placed to see these difficult but important objects.
Seeing the Planets for the Trees
A storm ten times bigger than Earth
New data provides further confirmation of dark energy
New data provides further confirmation of the existence of dark energy.
New data provides further confirmation of the existence of dark energy.
Using a black hole as your starship engine
Astronomers, Kepler, and SETI@home team up to find exoplanets
Astronomers, Kepler, and SETI@home team up to find exoplanets.
Astronomers, Kepler, and SETI@home team up to find exoplanets.
Is Gliese 581d habitable? Maybe
Is the extrasolar planet Gliese 581d habitable? Maybe.
Is the extrasolar planet Gliese 581d habitable? Maybe.
Private citizen commits $25 million for Giant Magellan Telescope
Private citizen has just donated $25 million for the construction of the Giant Magellan Telescope.
This is how it used to be done all the time: All the early giant telescopes built in the United States before World War II were financed by individuals or private foundations, with no or little government investment.
Private citizen has just donated $25 million for the construction of the Giant Magellan Telescope.
This is how it used to be done all the time: All the early giant telescopes built in the United States before World War II were financed by individuals or private foundations, with no or little government investment.
The Crab Nebula erupts with flares six days
In mid-April the Crab Nebula erupted for six days, repeatedly emitting the most powerful flares ever recorded from the supernova remnant.
Scientists think the flares occur as the intense magnetic field near the pulsar undergoes sudden restructuring. Such changes can accelerate particles like electrons to velocities near the speed of light. As these high-speed electrons interact with the magnetic field, they emit gamma rays.
To account for the observed emission, scientists say the electrons must have energies 100 times greater than can be achieved in any particle accelerator on Earth. This makes them the highest-energy electrons known to be associated with any galactic source. Based on the rise and fall of gamma rays during the April outbursts, scientists estimate that the size of the emitting region must be comparable in size to the solar system.
In mid-April the Crab Nebula erupted for six days, repeatedly emitting the most powerful flares ever recorded from the supernova remnant.
Scientists think the flares occur as the intense magnetic field near the pulsar undergoes sudden restructuring. Such changes can accelerate particles like electrons to velocities near the speed of light. As these high-speed electrons interact with the magnetic field, they emit gamma rays.
To account for the observed emission, scientists say the electrons must have energies 100 times greater than can be achieved in any particle accelerator on Earth. This makes them the highest-energy electrons known to be associated with any galactic source. Based on the rise and fall of gamma rays during the April outbursts, scientists estimate that the size of the emitting region must be comparable in size to the solar system.
Dawn Captures First Image of Asteroid Vesta
Dawn captures its first image of the asteroid Vesta as it closes in on a rendezvous set for July 16.
Dawn captures its first image of the asteroid Vesta as it closes in on a rendezvous set for July 16.
Stardust’s images show that Deep Impact burst underground bubbles on Comet Tempel 1
Pop! Analysis of the images that Stardust took of Comet Tempel 1 strongly suggest that when Deep Impact hit the comet’s surface it broke open several underground cavities that then burst like balloons.
Pop! Analysis of the images that Stardust took of Comet Tempel 1 strongly suggest that when Deep Impact hit the comet’s surface it broke open several underground cavities that then burst like balloons.
Dark matter mysteries
Every year, as part of its educational and research mission, the Space Telescope and Science Institute in Baltimore, Maryland holds a science symposium that focuses one of the big questions of astronomy, inviting over a hundred scientists to come and give their individual perspectives on the state of the field.
This year’s symposium ended yesterday, and the subject was the mysteries of dark matter. Though I wasn’t able to attend the symposium itself, they held a workshop for journalists yesterday, which I did attend. (You can watch the webcast here.)
So, what is dark matter?
First of all, it isn’t dark energy. Dark energy is that mysterious unknown phenomenon that is causing — on vast scales of many billions of light years — the expansion of the universe to accelerate rather than decelerate. It has nothing to do with the question of dark matter.
Second, no one knows. All that scientists do know is that objects in the outer regions of galaxies as well as the galaxies themselves don’t move at the speeds and directions expected if their known mass and gravity were the only forces influencing them. In order to successfully plot their orbits and motions, astronomers have to add a gigantic halo of extra mass, which they have dubbed “dark matter” because it is unseen, undetected, and completely invisible.
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A subsurface ocean of water on Titan
Scientists have found evidence that a subsurface ocean of water and ammonia exists within Saturn’s moon Titan.
Scientists have found evidence that a subsurface ocean of water and ammonia exists within Saturn’s moon Titan.
Dark matter: light or heavy?
Dark matter: light or heavy?
Later today I will be attending press conference at a symposium on dark matter that is being held this week at the Space Telescope Science Institute in Baltimore. I will post more on this subject then.
Dark matter: light or heavy?
Later today I will be attending press conference at a symposium on dark matter that is being held this week at the Space Telescope Science Institute in Baltimore. I will post more on this subject then.
Finding anti-matter from ISS
Why is the Meathook Galaxy lopsided?
Why is the Meathook galaxy lopsided?
Why is the Meathook galaxy lopsided?