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We summarize the week's scientific breakthroughs every Thursday.
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		AstronomySupernovas, gamma-ray bursts: Two of a kind?
Astronomers have uncovered direct evidence that gamma-ray bursts are linked to supernovas.
By Ron Cowen - 			
			
		Planetary ScienceMars Photo of the Day
With a stock of more than 120,000 images, the camera team for NASA’s Mars Global Surveyor mission has started daily postings of pictures to showcase the diversity of Martian landscapes. Click on the photo to obtain additional information about what the image reveals. Go to: http://www.msss.com/
By Science News - 			
			
		AstronomyStarry View: Image reveals galaxy’s violent past
The most detailed visible-light picture ever taken of the heavens reveals that the nearby Andromeda galaxy has had a much more violent history than our own Milky Way has.
By Ron Cowen - 			
			
		AstronomyFast-track planet
Astronomers have found a planet that's the closest yet known to its parent star, whipping around the star every 28.5 hours.
By Ron Cowen - 			
			
		AstronomyChemistry of the Cosmos: Quasars illuminate the young universe
Measuring the composition of some of the earliest structures in the universe, two teams of astronomers have unveiled new findings about star formation in the young cosmos.
By Ron Cowen - 			
			
		Planetary ScienceRoving on the Red Planet
NASA last month selected the landing sites for rovers scheduled to begin exploring the Martian surface next January.
By Ron Cowen - 			
			
		AstronomyTelescope takes close-ups of distant star
Radio astronomers have for the first time probed ejected gas in the immediate surroundings of a distant star.
By Ron Cowen - 			
			
		AstronomyYoung pulsar has a split personality
A new pulsar, the youngest discovered to date, unexpectedly exhibits properties of both regular pulsars and a recently explored class of supermagnetic pulsars, the magnetars.
By Ruth Bennett - 			
			
		AstronomyBig, Bigger . . . Biggest?
Galaxy map reveals the limits of cosmic structure.
By Ron Cowen - 			
			
		AstronomyEchoes of a stellar outburst
Light from the outburst of a star has revealed its dusty surroundings.
By Ron Cowen - 			
			
		AstronomyComet LINEAR: Breaking up isn’t hard to do
New images reveal that Comet LINEAR, which passed near the sun late last month, has broken into at least 10 fragments.
By Ron Cowen - 			
			
		AstronomyOnce Upon a Time in the Cosmos: Using distant galaxies to study the early universe
Peering far back in time, two teams of astronomers report that they have found some of the universe's earliest galaxies.
By Ron Cowen