It is titled The Perseus Cluster's X-Ray Skull
Explanation:
This haunting image from the orbiting Chandra Observatory reveals the Perseus Cluster of
Galaxies in x-rays, photons with a thousand or more times the energy of visible light.
Three hundred twenty million light-years distant, the Perseus Cluster contains thousands
of galaxies, but none of them are seen here. more >>
It is titled X-Rays From HCG 62
Explanation: Scanning
the skies for galaxies Canadian astronomer Paul Hickson and colleagues identified some 100
compact groups of galaxies, now appropriately called Hickson Compact Groups (HCGs). With
only a few member galaxies per group, HCGs are much smaller than the immense clusters of
galaxies which lurk in the cosmos, but like the large galaxy clusters, some HCGs seem to
be filled with hot, x-ray emitting gas. more >>
It is titled Saturn At Night
Explanation:
From a spectacular vantage point over 1.4 billion kilometers from the sun, the Voyager 1
spacecraft looked back toward the inner solar system to record this startling view of
Saturn's night side. The picture was taken on November 16, 1980, some four days after the
robot spacecraft's closest approach to the gorgeous gas giant. more >>
It is titled Earth at Night
Explanation:
This is what the Earth looks like at night. Can you find your favorite country or city?
Surprisingly, city lights make this task quite possible. Human-made lights highlight
particularly developed or populated areas of the Earth's surface, including the seaboards
of Europe, the eastern United States, and Japan. more >>