The Universe

Front

What is the most commonly accepted theory that explains the beginning of our known universe?

Back

Big Bang Theory

Front

What stage in a star's life cycle is described when gravity pulls gases and dust particles together, leading to nuclear fusion?

Back

The birth of a star

Front

What are electromagnetic waves?

Back

Energy that travels through space very quickly.

Front

Why do scientists use light years to measure objects in space?

Back

Because of the massive distances in the galaxy and universe.

Front

What is the term for galaxies that are moving away from us?

Back

Red shifting.

Front

What is the definition of a galaxy?

Back

A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.

Front

What is a black hole?

Back

A region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.

Front

What is nuclear fusion?

Back

The process by which two or more atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is the difference between a star and a planet?

Back

A star is a luminous celestial body made of plasma, while a planet is a celestial body that orbits a star and does not produce its own light.

Front

What is the observable universe?

Back

The part of the universe that we can see and measure, limited by the speed of light.