Astronomy Picture of the Day

Astronomy Picture of the Day NASA

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Explanation: There are more bacteriophages on Earth than any other life-like form. These small viruses are not clearly a form of life, since when not attached to bacteria they are completely dormant. Bacteriophages attack and eat bacteria and have likely been doing so for over 3 billion years ago. Although initially discovered early last century, the tremendous abundance of phages was realized more recently when it was found that a single drop of common seawater typically contains millions of them. Extrapolating, phages are likely to be at least a billion billion (sic) times more numerous than humans. Pictured above is an electron micrograph of over a dozen bacteriophages attached to a single bacterium. Phages are very small -- it would take about a million of them laid end-to-end to span even one millimeter. The ability to kill bacteria makes phages a potential ally against bacteria that cause human disease, although bacteriophages are not yet well enough understood to be in wide spread medical use

http://antwrp.gsfc.nasa.gov/apod/astropix.html

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Universe Today...

Branson to be the First to Marry Couples in Space

He's married a couple on board a Virgin Atlantic jet, he's also officiated the marriage of Google's co-founder Larry Page on his private island in the Caribbean, now Richard Branson wants to marry couples as they reach the apex of their Virgin Galactic flights into space. The British billionaire already has two wedding-related bookings, one marriage and one honeymoon, and it is hoped he will obtain a licence to conduct the ceremonies for more. Certainly unique, but I wonder how popular getting hitched in zero gravity will be

Soyuz Crew Safe After a Violent Re-entry and Landing 400km Off-target

The Russian Soyuz re-entry capsule, carrying the first South Korean astronaut back to Earth, suffered a "ballistic re-entry" on Saturday, putting the capsule 400 km (250 miles) off-target. This is the second time in a row that the return vessel has landed off course; even officials were shocked about this inaccuracy. The astronauts endured forces of up to 10-G as the capsule took a very steep trajectory as it dropped through the atmosphere for three and half hours. Fortunately the three crew members are safe and well. What's the explanation for the mishap? An unauthorized change to the flight plan and an old naval superstition…

 

The Debate Continues: Water or Land Landings for Orion

The development of Constellation is continuing, the U.S. program that will replace the shuttle and send astronauts back to the moon. Two unresolved issues have stood out specifically for the Orion crew vehicle: Orion is currently too heavy for the Ares vehicle to launch it from Earth, and the decision on whether Orion will land in water or on land has yet to be determined. Originally, land landings were the preferred choice, but last December, it appeared program managers were leaning towards returning to the water landings seen during the Apollo era. But recently NASASpaceflight.com reported on a possible solution for the weight problem that could potentially provide an improved capacity for landing on land as well.

www.universetoday.com to finish reading the above...

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Australian Observatory Captures New Nova In Sagittarius Written by Tammy Plotner

http://www.universetoday.com/2008/04/19/australian-observatory-first-to-capture-new-nova-in-sagittarius/

Hold on to your hats… It's happening again. According to AAVSO Special Notice #105 released on April 19, another possible nova event is now occurring in Sagittarius. Through their quick actions, Macedon Ranges Observatory in Central Victoria, Australia was on top the alert and imaging.

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