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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,

Which of the following is not a type of galaxy classification?

What type of star is our Sun? (Use the catagory we discussed in class to answer this question)

The single most important physical characteristic in determining the amount of time that a given star spends on the Main sequence is

During star formation, the dense parts of the molecular cloud that collect material while contracting and heating up are known as

A star’s lifetime, luminosity, and eventual fate is determined by