ESS1A Universe

What is a light year?

• The distance that light travels in one year

• Buzz's name

• A large collection of stars, gas, and dust that is help together by gravity

• The measure of a star's brightness

Which star has the greatest luminosity?

• Vega

• Aldebaran

• Sirius

• Betelgeuse

Which star looks looks the brightest from Earth?

• Sirius

• Aldebaran

• Rigel

• Vega

Which of these shows the correct order from coolest to hottest?

• red, yellow, white, blue

• white, blue, yellow, red

• yellow, white, blue, red

• blue, yellow, white, red

If a star is 15 ly from Earth, how long does it take light from that star to reach Earth?

• 15 minutes

• 15 light years

• 15 years

• 15 hours

Consider the color of the sun. Based on this color, what is the sun's approximate surface temperature?

• 5,000-6,000

• 6000-7500

• 30000-60000

• <3500

Which statement best describes stars?

• large planets that are composed mostly of gases

• celestial bodies made of gas that give off light

• faint dots of light that can be seen from Earth's surface

• objects that form in the outer parts of the solar system

Absolute magnitude is defined as…

• mass of a star

• color of a star

• brightness of a star, as it appears from Earth

• brightness of a star independent from the distance of Earth

About 90 percent of the stars in the universe, including the sun, are main sequence stars. What do all main sequence stars have in common?

• All main sequence stars are yellow like our sun.

• All main sequence stars are as bright as our sun.

• They are all undergoing fusion of helium into carbon within their cores

• They are undergoing fusion of hydrogen into helium within their cores

White dwarfs stars are

• hot and dim

• cool and dim

• hot and bright

• cool and bright

Tags

NGSS.HS-ESS1-3