3rd Grade Review- Stars

A star named Sirius appears as the brightest star in the nighttime sky, even though a star named Pollux actually gives off more light. Which of the following best explains why Sirius appears brighter than Pollux in our nighttime sky?

• Sirius has a different color than Pollux has.

• Sirius has different gases than Pollux has.

• Sirius is closer to Earth than Pollux is.

• Sirius is larger than Pollux is.

Betelgeuse is a star that is much larger than our Sun. Betelgeuse appears as only a small, bright point of light in the night sky. Which best explains why the Sun appears so much bigger than Betelgeuse?

• A. Betelgeuse is millions of miles away.

• Betelgeuse is much older than the Sun.

• Betelgeuse is moving towards Earth.

• Betelgeuse is not as hot as the Sun.

Jerome notices that two stars appear to have the same brightness. He knows that one of the stars is much farther away than the other. What could he claim about the two stars?

• The one that is closer must be brighter.

• The one that is farther away must be bigger.

• Both stars must have exactly the same brightness.

• Both stars must give off exactly the same amount of energy.

Natalia is looking at two stars in the night sky. She knows that both stars are the same size. How can she tell which star is closest to Earth?

• Use a telescope to measure how far each star is.

• The star that is the brightest is the closest.

• If the stars are the same size then must also be the same distance from Earth.

• Measure how high in the sky each star is.

Andy and Ryan enjoy looking at the stars at night when they go to their grandparents’ farm out in the country. They can see so many stars out there! Andy and Ryan are trying to come up with one thing that is true for all the stars they see. What is true about all the stars that Andy and Ryan can see in the night sky?

• They are all the same brightness.

• They are all the same size.

• They are all smaller than Earth.

• They are all farther away than the Sun.

What is the name for a tool that makes faraway objects in the night sky appear closer and larger?

• Telescope

• Hand Lens

• Microscope

• Magnet

Heidi is looking at stars with a telescope on a clear night. She notices that she can see many more stars in the same part of the sky when she looks through the telescope than when she looks just with her eyes. Which claim explains why she can see more stars with a telescope?

• The telescope creates more light to make the stars easier to see.

• The telescope causes the dimmer stars to give off more light energy.

• The telescope lets her see through clouds that block the light coming from stars.

• The telescope will magnify the light of dimmer stars that she cannot see without the telescope.

Sara was looking at stars in the night sky while on a camping trip with her family. Her mother brought a telescope and they used it to look at stars together. How will the night sky look different to Sara and her mother through the telescope as compared to looking only with their eyes?

• The stars will appear to be farther away.

• Most of the stars will seem to be much smaller.

• They will be able to see many more stars.

• Stars that looked red will now seem to be blue in color.