Chapter 29 Stars

All stars, regardless of size, eventually ____.

• turn into black dwarfs

• explode

• run out of fuel and collapse

• become black holes

In the cores of extremely hot red giants, nuclear reactions convert helium to ____.

• carbon

• hydrogen

• lead

• argon

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

The sun is a ____.

• black hole

• black dwarf

• main-sequence star

• red giant

What characteristic of stars is measured by luminosity?

• brightness

• size

• temperature

• distance from Earth

Which of the following units is used to express the size of stars?

• kilometer

• light-year

• solar radius

• astronomical unit

Two stars have the same apparent magnitude as seen from Earth’s surface. Star A is 33 ly away. Star B is 346 ly away. Which of the following statements is true?

• Star B is larger than star A.

• Star B is more luminous than star A.

• The stars have the same absolute magnitude.

• Star A has a smaller absolute magnitude.

Which term best describes the movement of matter due to temperature differences in the sun?

• conduction

• convection

• nuclear fusion

• radiation

Tags

NGSS.HS-ESS1-1

Stars of which color have the coolest surface temperature?

• red

• orange

• yellow

• blue

A light-year is approximately ____.

• 9.5 trillion kilometers

• 95 trillion kilometers

• 150 million kilometers

• 150 billion kilometers

Tags

NGSS.MS-ESS1-3

Stellar distances are usually expressed in what units?

• miles

• kilometers

• light-years

• none of the above