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This striking new NASA/ESA Hubble Space Telescope image shows a glittering bauble named Messier 92.Located in the northern constellation of Hercules, this globular cluster - a ball of stars that orbits a galactic core like a satellite - was first discovered by astronomer Johann Elert Bode in 1777.
In a mouse's hippocampus, brain cells known as microglia (red) can eliminate connections between nerve cells (blue) that are thought to store some types of memories.
The picture shows Abell 2218, a rich galaxy cluster composed of thousands of individual galaxies. It sits about 2
This is the first in a sequence of four pictures from the
