Stars and Light

In comparison to other stars in the sky, the sun appears brighter because it is–

• hotter.

• larger.

• older.

• closer.

One of the closest stars to Earth is Alpha Centauri A. It is larger than the sun, yet it appears much less bright. Which of the following is the best explanation for this?

• The smaller a star is, the more concentrated its energy is, so it appears brighter.

• The difference in brightness is due to the difference in relative distance.

• Dust in the Earth’s atmosphere absorbs the light of all the stars we see.

• As stars get older, the amount of light they give off decreases.

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

Which of the following observations would provide evidence to support the explanation for why some stars that are larger than the sun appear to be less bright?

• A 100-watt lightbulb is much brighter than a 25-watt bulb, even if both bulbs are exactly the same size.

• A flashlight appears dimmer if it is covered with different colored lenses that change the color of the light it gives off.

• A large campfire seen at a distance of one kilometer is not as bright as a candle that is 50 centimeters away.

• Most stars are not visible during the day because the brightness of the Sun is much greater.

Tags

NGSS.MS-PS4-1

Why don't the same constellations appear every season?

• Because God does not want to show them to us.

• Because Earth is rotating on its axis and revolving around the sun.

• Because the stars burn out and light again.

• Because the stars move farther from the earth.

Tags

NGSS.MS-ESS1-1

Ursa is a star that is visible during the summer. Which of these is the best explanation why it is not seen during the winter.

• The Earth is revolving around the sun.

• It leaves because it does not like winter.

• The gas content dies out.

• Atmospheric Pollution.

Tags

NGSS.MS-ESS1-1

What is the definition of axis?

• a tool used to cut with

• to get permission

• an imaginary line through a center of a sphere

• type of food

About how much time does it take for the Moon to complete an orbit around the Earth?

• 1 day

• 1 month

• 1 year

• 365 months

Tags

NGSS.MS-ESS1-1

When the whole surface of the Moon is visible to us on Earth,it is called a _________. When the side of the Moon facing us is dark it is called a __________.

• New Moon, Full Moon

• First Quarter, Third Quarter

• Light Moon, Dark Moon

• Full Moon, New Moon

Tags

NGSS.MS-ESS1-1

The ________ is responsible for many patterns and cycles in our solar system.

• Sun

• Moon

• Orbits

• Earth

Tags

NGSS.MS-ESS1-1