Intro to Space Week 4

Front

Why do planets orbit the sun?

Back

The sun's gravity keeps them in place.

Front

What event created all matter in the universe and spacetime?

Back

The Big Bang.

Front

What is the correct hierarchy of cosmic structures from largest to smallest?

Back

universe, galaxy, solar system, star, planet.

Front

In which galaxy do we live?

Back

Milky Way.

Front

What does it mean that the universe is expanding?

Back

All of the galaxies are spreading out, the universe must have started from a single point, and the universe is cooling down.

Front

What is gravity?

Back

A force that attracts two bodies towards each other, keeping planets in orbit around the sun.

Front

What is a galaxy?

Back

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

Front

What is a solar system?

Back

A collection of planets and other celestial bodies that orbit a star.

Front

What is a star?

Back

A luminous celestial body made of plasma, generating energy through nuclear fusion.

Front

What is a planet?

Back

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