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The ionized tail of a comet is always pointing

The large flat plains on the Moon are called Maria. The Maria were formed

What triggers star formation in the spiral arms of spiral galaxies?

Which of the following types of galaxies are most commonly found in the center of large clusters?

What can you conclude from knowing that the disk of a galaxy contains population 1 stars as well as O and B stars?

What percentage of visible matter is made of Hydrogen?

How many fundamental forces are known in science?

List the Eras of the Big Bang Theory in chronological order. ____ era ____ era ____ era ____ era ____ era ____ era ____ era ____ era

What is the observed temperature of the Cosmic Microwave Background (CMB)?

Which is the classification given to a galaxy with a large nuclear bulge, and tightly wound arms starting from a bar through the nuclear bulge?    By ESO – http://www.eso.org/public/images/potw1204a/, CC BY 3.0,