Scientists hypothesize that more than _________ of the universe's mass is dark matter.

Galaxies can be spiral, elliptical, or regular.

Spiral Galaxies have the following characteristics. (mark 5)

Elliptical Galaxies have the following characteristics. (mark 4)

Irregular Galaxies have the following characteristics. (mark 4)

Which galaxy is this?

Which galaxy is this?

Which galaxy is this?

Galaxies are distributed evenly in the universe.

Gravity holds galaxies together in groups called _____________.

Virgo Cluster and Local Group are two examples of ___________.

Most clusters exist in even larger structures called ____________________.

The Milky Way is an elliptical galaxy

The Milky Way is part of the Local Group cluster. ____________________ is the largest galaxy in this cluster.

According to _______________, the universe began from one point billions of years ago and has been expanding ever since.

The shift to a different wavelength is called the ______________.

"Creationism" is the name given to the belief that the creation story of Genesis is the literal truth about how the world came into being. This is referred to _________.

a cloud of gas and dust

matter that emits no light at any wavelength