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The Universe originated billions of years ago in an expansion from a single point of infinite energy density.
What is the big bang theory?
An explanation of some natural world aspect that is based on facts coming from experimentation and observation.
What is a theory?
The galaxy of our Solar System belongs to.
What is the Milky Way Galaxy?
One of a vast number of stars in the Milky Way. It is half way through its cycle of 10 billion years.
What is the sun?
A celestial object that does 3 things:
1. Orbits the sun
2. Has enough mass to be round due to gravity.
3. Has removed debris from its moving path.
What is a planet?
13.7 billion years old
What is the age of the universe?
A giant structure that contains hundreds of billions of stars.
What is a galaxy?
One of three types of galaxies. The Milky Way is this type of galaxy.
What is a spiral galaxy?
A luminous ball of gas, mostly hydrogen and helium, held together by its own gravity.
Stages of the Star:
1. Forms
2. Evolves in size
3. Mass
4. Burns out
What is a star?
An object that revolves around a planet.
What is a moon?