The Universe _______________________________________________________________________________________________________________________________________________________________________________________________________________________
4. Cosmology
The study of the Universe is called Cosmology.
Cosmologists study the structure and changes in the present Universe.
The Universecontains all of the star systems, galaxies, gas and dust, and all the matter and energy that exist. The universe also includes all of space and time.
The part of the entire Universe that we can see (because light from objects has had time to reach us) is called the observable universe.
Earth is just a tiny speck in the universe. Our planet is surrounded by lots of space. Light travels across empty space. Light is the visible part of the electromagnetic spectrum.
Figure 4.26 This is an illustration of the location of Earth in the Universe. It consists of a series of nine frames that show the Earth, solar system, Orion arm of the MilkyWay, Milky Way near other galaxies in the Local Group, Virgo Supercluster, Laniakea Supercluster.....
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