7th grade Earth Science Universe Structure

What is a galaxy

• A celestial object that orbits a star

• A hot sphere of plasma that produces its own energy

• A cluster of stars, dust, gas and matter

• A system of planets that orbit a star

What is a planetary system

• A cluster of solid and rocky objects in space

• A system of stars that orbit a planet

• A system of planets that orbit a star

• A cluster of stars, dust and planets

What units are typically used to measure distances in space?

• Meters

• Kilometers

• Sound years

• Light years

How big is a light year

• 600 miles

• 600,000 miles

• 6 million miles

• 6 trillion miles

What is a celestial object?

• Only stars

• Only planets

• objects that humans have put in space

• any natural object found in space

What is the difference between a moon and a planet?

• Planets are always bigger than moons

• A planet's gravity makes it round but a moon's does not

• A planet has cleared its orbital path but a moon has not

• A planet orbits a star while a moon orbits a planet

Which of these planets are gas giant (choose all that apply)

• Mercury

• Mars

• Jupiter

• Saturn

• Uranus

Which planet is often identified by its prominent ring structure?

• Venus

• Jupiter

• Saturn

• Neptune

The color of a star tells you about

• The size of the star

• the brightness of the star

• how far away the star is

• the surface temperature of the star

What term do we use to describe the brightness of the star?

• Radiation

• Luminosity

• Color

• Spectroscopy