First Quarter Moon occurs at 7:28 A.M. EST. The Moon then reaches perigee, the closest point to Earth in its orbit, at 6:14 P.M. EST. At that time, our satellite will be 229,991 miles (370,135 ...

Add Yahoo as a preferred source to see more of our stories on Google. The Chandra X-ray Observatory view of galaxy group NGC 4839 has revealed that it is "plunging into the Coma galaxy cluster and ...

The constellation Coma Berenices, located near Arcturus and Denebola, contains the Coma Cluster. The Coma Cluster comprises over 1000 galaxies within a 4° area of the sky, with a denser concentration ...

Many of us have seen intricate patterns that milk makes in coffee and much smoother ones that honey makes when stirred with a spoon. Which of these cases best describes the behavior of the hot gas in ...

Galaxy clusters are the largest structures in the Universe held together by gravity. Enclosing the hundreds or thousands of galaxies are enormous amounts of superheated gas that glow in X-ray light.

Credit: NASA/ESA Spring is almost here, which means it's galaxy season for amateur astronomers! Grab your telescope and join ...

Looking for a sky event this week? Check out our full Sky This Week column. February 23: The Moon occults some Pleiads First Quarter Moon occurs at 7:28 A.M. EST. The Moon then reaches perigee, the ...