Components of the Universe

Front

What is a star?

Back

A star is a celestial body composed of gases that emit light due to nuclear reactions.

Front

What do all stars start as?

Back

All stars start as gas and dust in a nebula.

Front

What is a nebula?

Back

A nebula is a large cloud of gas and dust in interstellar space; it is the predecessor to stars.

Front

Why does the sun appear brighter than other stars?

Back

The sun is much closer to Earth than other stars are.

Front

What keeps Earth in its orbit around the sun?

Back

The gravitational attraction between the sun and Earth.

Front

What is the main component of stars?

Back

Stars are primarily composed of hydrogen and helium.

Front

What is the process by which stars emit light?

Back

Stars emit light due to nuclear fusion reactions occurring in their cores.

Front

What is the life cycle of a star?

Back

The life cycle of a star includes stages such as nebula, main sequence, red giant, and supernova.

Front

What is a black hole?

Back

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

Front

What is a galaxy?

Back

A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.