The Milky Way

The sun and earth's planetary system is located in a spiral galaxy named The Milky Way." The galaxy is estimated to have some 400 billion stars with more in the making.

Spiral Galaxies

Spiral galaxies are large clusters of stars that are in the shape of an elongated oval and appear to be flat celestial objects. Spiral galaxies make up the majority of the galaxies that have been discovered thus far.

Andromeda

Andromeda is the closest galaxy to the Milky Way Galaxy. It is a spiral galaxy and is approximately 2.5 million light years from earth.

Heliocentric Planetary System

A heliocentric planetary system has its star at the center of the system with its planets orbiting around it. The earth's planetary system is heliocentric.

The Origin of the Species

"The Origin of the Species" is the life-work of naturalist Charles Darwin. It contains his theory about the...