SC.5.E.5.1 Form A

1. Gabriel notices that when he looks at the stars at night, some appear to be brighter than other stars. Which three factors affect how bright a star appears to an observer on Earth?

• the star's energy, size, and temperature
• the star's color, size, and distance from Earth
• the star's size, temperature, and distance from Earth
• the star's movement, distance from Earth, and gravity

2. Which of the following is true of the sun?

• The sun is the closest star to Earth.
• The sun is the largest object in the Milky Way.
• The sun is the largest planet in our Solar System.
• The sun is an example of a galaxy that gives off light energy.

3. Which of the following consists of gas, dust, and many stars?

• the Sun
• a galaxy
• a solar system
• the Earth’s atmosphere

4. Peter has learned that many stars are actually larger than the sun. If this is true, why do these stars appear like points of light in the sky?

• These stars are hotter than the sun.
• These stars have less mass than the sun.
• These stars are farther away from Earth than the sun.
• These stars are made of different chemicals than the sun.

5. Wanda is studying the stars and she learns that Barnard's star is the third closest star to Earth, although it cannot be seen without a telescope. She also knows that the brightest star in the night sky, Sirius, is much farther away but can be seen without a telescope.Which of the following explains why Sirius can be seen without a telescope?

• Sirius is much larger and hotter than Barnard's star.
• Barnard's star is much larger and hotter than Sirius.
• All stars are the same size, so Sirius must be hotter than Barnard's star.
• All stars are the same temperature, so Sirius must be larger than Barnard's star.