Front

What was the primary Elements of the nebula that formed our solar system?

Back

Hydrogen and helium

Front

Which process marks the birth of a star?

Back

Nuclear fusion

Front

Where did the first object form in our solar system?

Back

At the center

Front

What happens next when a main sequence star starts to run out of hydrogen fuel?

Back

It becomes a red giant.

Front

What is a supernova?

Back

An exploding star

Front

What type of galaxy is the Milky Way?

Back

Barred spiral galaxy

Front

Approximately how many stars are in the Milky Way?

Back

300 billion

Front

What happens to light when it encounters a black hole?

Back

It cannot escape.

Front

What is the approximate width of the Milky Way?

Back

100,000 light years

Front

What causes galaxies to move away from each other?

Back

Universe expansion