Saturn, Jupiter, Uranus, and Neptune

The galaxy that holds our solar system.

This causes a person to feel weightless in space.

A telescope with a lens and a mirror.

The spinning of Earth on its axis.

Mercury, Venus, Earth, and Mars

All galaxies are rapidly moving _____ from each other.

A person's _______ must work harder to pump blood during free fall.

A telescope with a tube and one concave lens.

The moon is shadowed from Earth.

A large object that circles a star and does not produce its own light.

The universe began with an explosion from a ball of matter and energy.

Bones lose this during free fall.

This is necessary for astronauts to use the restroom in space.

The moon appears a reddish, orange color.

The complete circular orbit of planets around the sun.

Edwin Hubble discovered that galaxies could be classified into 3 groups.

The planets with a gravitational pull.

This would allow for the oxygen and water cycles in space.

A dust particle that burns as it enters Earth's atmosphere.

63 moons orbit this planet.

The shape of the Milky Way Galaxy

Gravity causes all objects to move ______.

Astronauts study at this locations

The cause of earth's changing seasons and climates.