The size of the Universe

Scientists think the Milky Way probably is

• a nebula
• a spiral galaxy
• an elliptical galaxy
• an irregular galaxy

Our nearest star neighbor, Proxima Centauri, is 4 light years away from Earth. How old is the light by the time we see it?

• 4,000 years-old
• 400 years-old
• 4 years-old
• 40 years-old

Explain why the sun and moon appear to be the same size even though the sun is much larger.

• The sun appears smaller next to the larger moon.
• The moon is closer to the Earth than the sun.
• The moon revolves faster than the earth.
• The sun and the moon are the same distance from Earth.

A light year is related to ...

• Time
• Energy
• Distance
• Mass

Where is the Earth found in our Milky Way Galaxy?

• In the middle of the galaxy

• On the Edge of a Spiral arm

• In Andromeda

• Earth is moving side to side of the galaxy

Why do other stars appear so much smaller than the sun?

• They are much smaller
• They are so far away
• They are not as bright
• They are dwarf stars

A super giant explodes in a supernova...

• 1. has no effect on anything

• 2. that always lasts millions of years

• 3. and hydrogen, helium and other heavier elements are ejected

• 1, 2, and 3 occur.

Most scientists believe the Big Bang Theory explains which of the following questions?

• How our planets and moons formed

• How our universe began

• How the sun turns hydrogen into helium

• How fast light travels through space

Tags

NGSS.HS-ESS1-2

Felix examined several photos of stars. To compare their temperatures, he looked at the colors of the stars. He organized the photos in order from coolest to hottest. Which of these answers shows the correct order?

• red, yellow, white, blue

• white, blue, yellow, red

• yellow, white, blue, red

• blue, yellow, white, red

Our solar system consists of eight planets. Which phrase correctly describes a planet?

• a large celestial body that is composed of gas and emits light

• any one of the primary bodies that orbits a star

• many stars held together by gravity

• space and all the matter and energy in it