What percentage of visible matter is made of Hydrogen?

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)?

The letters G U T  from the GUT Era stand for Grand Unified Theory. This theory explains how 3 of the fundamental forces are indistinguishable. Which three forces does it describe?

Below you will find 5 numbered images. Match the image number with the correct galaxy classification. 1–     2– 3–     4– 5–

Examine the spectra of four galaxies compared to the laboratory spectrum.  According to the Hubble Law, which galaxy is most distant? 

Below you will find 5 numbered images. Match the image number with the correct galaxy classification. 1–     2– 3–     4– 5–

Which point on the Hertzprung-Russell diagram represents the main sequence star with the longest lifetime?

Please match each moon to the planet it orbits. Some planets may be used more than once or maybe not at all.

Astrology (not astronomy) is considered a pseudoscience because