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Melvin Lusterio
May 09, 2013 08:05PM

The Good Force be with you! Very good, Carolyn & Team Cassini, thanks for...
Melvin Lusterio
May 09, 2013 08:05PM

The Good Force be with you! Well done, Team Curiosity! Keep it up! Live fo...
Melvin Lusterio
May 09, 2013 07:05PM

The Good Force be with you! Excellent, Prof. Harry, thanks for the infos! Kee...
John Clarkson
June 11, 2011 10:06AM

I don't understand what they are on about here: The value of .033412 is deter...

Stars

Stars

A star is a massive, luminous ball of gas that is held together by its own gravity. The nearest star to Earth is the Sun. A star begins as a collapsing cloud of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Once the stellar core is sufficiently dense, some of the hydrogen is steadily converted into helium through the process of nuclear fusion. For most of its life, a star shines due to thermonuclear fusion in its core releasing energy that traverses the star's interior and then radiates into space. Almost all elements heavier than hydrogen and helium were created by fusion processes in stars.

    • Formation of Stars in Young Clusters Featured News Formation of Stars in Young Clusters Formation of Stars in Young Clusters

      Harvard-Smithsonian Center for Astrophysics (Oct. 12, 2009) – Most stars form in clusters. Recent studies of nearby star forming regions find that about three-quarters of their... More »

    • Massive Stars Near the Galactic Center Featured News Massive Stars Near the Galactic Center Massive Stars Near the Galactic Center

      Harvard-Smithsonian Center for Astrophysics (Sep. 12, 2009) – The Central Molecular Zone (CMZ) of our galaxy is a giant complex of molecular gas and dust situated in the... More »

    • Trifid Nebula: A Star Factory Featured News Trifid Nebula: A Star Factory Trifid Nebula: A Star Factory

      European Southern Observatory (Aug. 25, 2009) – Today ESO has released a new image of the Trifid Nebula, showing just why it is a firm favourite of astronomers, amateur and... More »

    • Galaxies Demand a Stellar Recount Featured News Galaxies Demand a Stellar Recount Galaxies Demand a Stellar Recount

      NASA JPL, Pasadena, CA (Aug. 20, 2009) – For decades, astronomers have gone about their business of studying the cosmos with the assumption that stars of certain sizes form in... More »

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