The planet that has a rotation period longer than its year is

The question asked in Olber’s Paradox of cosmology is

Regions of high gravity do not expand with the expansion of space-time. Are galaxies considered regions of high gravity?

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 of the following types of galaxies are reddest in color?

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

What is the primary ingredient in the Earth’s atmosphere?

The method used by Hubble to determine the distance to the Andromeda galaxy was

The least dense planet in the solar system is