THE UNIVERSE

Front

What is the universe?

Back

The universe is all of space and time, including all matter and energy, galaxies, stars, planets, and everything that exists.

Front

What is a galaxy?

Back

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

Front

Which galaxy is most like our own Milky Way?

Back

The Andromeda Galaxy is the galaxy most similar to the Milky Way.

Front

What is a star?

Back

A star is a luminous sphere of plasma held together by its own gravity, undergoing nuclear fusion.

Front

What is nuclear fusion?

Back

Nuclear fusion is the process by which two light atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is the life cycle of a star?

Back

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

Front

What determines the color of a star?

Back

The color of a star depends on its temperature; hotter stars appear blue, while cooler stars appear red.

Front

What is gravity?

Back

Gravity is a force that attracts two bodies toward each other, depending on their masses and the distance between them.

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 planet?

Back

A planet is a celestial body that orbits a star, is spherical in shape, and has cleared its orbit of other debris.