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  • Sharon Souther

    Best NASA Photos Of The Week

  • Teresa Tieben

    Cas A: Optical and Xray

  • Kathleen Quinn

    The aftermath of a cosmic cataclysm, supernova remnant Cassiopeia A (Cas A) is a comfortable 11,000 light-years away. Light from the Cas A supernova, the death explosion of a massive star, first reached Earth just 330 years ago. Still expanding, the explosion's debris cloud spans about 15 light-years near the center of this composite image. NASA

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See Explanation. Clicking on the picture will download the highest resolution version available.

See Explanation. Clicking on the picture will download the highest resolution version available.

Near the outskirts of the Small Magellanic Cloud, a satellite galaxy some 200 thousand light-years distant, lies 5 million year young star cluster NGC 602.

N11: Star Clouds of the LMC - Astronomy Picture of the Day, 11 February 2013

~~Supernova remnant G266.2-1.2 (NASA, Chandra, 10/28/13) | NASA's Marshall Space Flight Center~~

~~Supernova Remnant Cassiopeia A (NASA, Chandra) ~ for the first time, a multiwavelength three-dimensional (3-D) reconstruction of a supernova remnant has been created. This stunning visualization of Cassiopeia A (Cas A), the result of an explosion approximately 330 years ago by NASA's Marshall Space Flight Center~~

A Halo for NGC 6164 Image Credit & Copyright: Don Goldman Explanation: Beautiful emission nebula NGC 6164 was created by a rare, hot, luminous O-type star, some 40 times as massive as the Sun. Seen at the center of the cosmic cloud, the star is a mere 3 to 4 million years old. In another three to four million years the massive star will end its life in a supernova explosion. Spanning around 4 light-years, the nebula itself has a bipolar symmetry.

Messier 9 , a cluster of stars 25,000 light years away toward the central bulge of our galaxy, made up of suns about twice as old as ours. We are so far away that they seem too close to each other not to collide. But, they are actually very far apart from each other.

The 16th century Portuguese navigator Ferdinand Magellan and his crew had plenty of time to study the southern sky during the first circumnavigation of planet Earth. As a result, two fuzzy cloud-like objects easily visible to southern hemisphere skygazers are known as the Clouds of Magellan, now understood to be satellite galaxies of our much larger, spiral Milky Way galaxy.

The universe is beautiful. NASA Releases Eight Stunning Never-Before-Seen Images of the Cosmos