Earth Science.Unit 1.Flashcard 1.25-26

Front

The Big Bang Theory states the universe began about how many years ago?

Back

13.8 billion years ago

Front

Which evidence shows that galaxies are moving away from us?

Back

Red shift of light

Front

What are the two lightest elements that formed soon after the Big Bang?

Back

Hydrogen and Helium

Front

What process powers stars by combining lighter elements into heavier ones?

Back

Nuclear fusion

Front

What happens to massive stars at the end of their lives?

Back

They explode as supernovae

Front

Which diagram classifies stars by luminosity, size, and temperature?

Back

Hertzsprung-Russell (HR) Diagram

Front

According to the Nebular Hypothesis, planets and stars formed from what?

Back

A rotating nebula of gas and dust

Front

What process caused small particles to clump together into larger planets?

Back

Accretion

Front

Why is Pluto no longer classified as a planet?

Back

It has not cleared its orbital path

Front

Which of the following is a terrestrial planet? Mars, Jupiter, Neptune, The Death Star

Back

Mars