The video explores the universe, including galaxies, stars, and constellations. It explains the solar system's structure, detailing the heliocentric model and the planets. The video contrasts the heliocentric and geocentric models, discusses celestial objects like comets and meteors, and describes natural and artificial satellites.

What is the universe continually doing?

• Expanding

• Staying the same size

• Disappearing

• Shrinking

What is a galaxy?

• A single star

• A constellation

• A group of stars

• A group of planets

Which constellation is part of the Milky Way?

• Cassiopeia

• Ursa Major

• Andromeda

• Orion

Which model places the Sun at the center of the solar system?

• Geocentric model

• Heliocentric model

• Ptolemaic model

• Copernican model

Which planet is not considered a planet anymore?

• Mars

• Neptune

• Pluto

• Venus

What are the inner planets made of?

• Rock

• Dust

• Ice

• Gas

What shape are the planetary orbits?

• Triangle

• Ellipse

• Circle

• Square

What are comets primarily made of?

• Ice and dust

• Sand and gravel

• Gas and liquid

• Rock and metal

What do we call meteors that hit the Earth's ground?

• Comets

• Meteorites

• Shooting stars

• Asteroids

What is the term for satellites launched by humans?

• Artificial satellites

• Natural satellites

• Communication satellites

• Space stations