Historical Models of Solar System

Name:______Date:______Pd:______Historical Models of Solar System Heliocentric Theory Geocentric Theory (“GEO” (“HELIO” CENTRIC) CENTRIC) Meaning of the Prefix

Definition

Astronomer Who Proposed the Theory DIAGRAM

1. ______is the study of the universe. A scientist who studies the universe is called an ______.

2. ______is the distance that light travels in one year; about 9.46 trillion kilometers. This unit is used to measure distance of objects in space. Galaxies (pages 596-597)

Galaxies (Types of Galaxies)

A large group of stars, dust and gas are called______. There are many different types of galaxies. ______, the astronomer for who the ______is named, began to classify______, mostly by their shapes, in the 1920’s.

Spiral Galaxies

______galaxies have a bulge at the center and spiral arms. The spiral arms are made up of ______, ______, and ______that have formed in these denser regions of gas and dust.

The Milky Way

Observing other galaxies and making measurements inside our galaxy, the ______, has led astronomers to think that our solar system is in a ______galaxy.

 We live in the ______galaxy.

 What is the shape of the Milky Way Galaxy? ______

Formation of the Universe (pages 600-601)

Big Bang Theory (What is it? When was it developed? Where did the evidence come from to support the Big Bang?)

______

Place the following in order from the Largest to the Smallest: Earth, Sun, Moon, Milky Way Galaxy, Universe, Solar System.

Largest Smallest

1. 2. 3. 4. 5. 6.