Science Unit 1

Why does the sun seem to be the brightest star?

• it is the closest star.

• it is the biggest star.

• it is the brightest star.

• it is the hottest star.

Which of the following best describes why most/some constellations are visible in the Northern Hemisphere but not in the Southern Hemisphere?

• because Earth revolves around the sun

• because the atmospheres are different

• because Earth's magnetic field keeps them fixed

• because the Sun's brightness makes them hard to see

Something that we observe to be similar over and over again is a(n) ___.

• rotation

• artifact

• pattern

• constellation

A(n) ___ is an arrangement of stars as seen from Earth.

• constellation

• asteroid belt

• comets

• meteoroids

The length of time it takes the Earth to orbit the Sun one time is a(n) ___.

• month

• day

• 24 hours

• year

How many of the stars, visible in the night sky, are closer to Earth than the sun?

• All of them

• None of them

• About half

• only one

Two students are looking at stars in the sky on a moonless night. One student points at a certain star and says that it is closer to Earth than all the other stars.

What evidence best supports the student's claim about the closeness of the star?

• The star is a different color than the other stars.

• The star is twinkling more than the other stars.

• The star appears brighter than the other stars.

• The star appears smaller than the other stars.

A ___ is something that scientists make to answer questions about the real world.

• gravity

• pattern

• model

• year

Why does the sun look so bright from Earth compared to the other stars in the sky?

Select ALL that apply.

• The sun is the only star in our solar system.

• The sun is much closer to Earth compared to all other stars.

• The sun is located in the Milky Way.

• The sun is the largest star in the universe.

___ can be seen only a few months at a time depending on the time of year.

• Shadows

• Constellations

• Moon

• Sun