Test 4 Earth Science 4th 9 Weeks

Distances to stars are usually expressed in units called

• miles

• kilometers

• light-years

• astronomical units

The measure of a star's brightness is called its

• parallax

• color index

• visual binary

• magnitude

Distance to nearby stars can be determined from

• fluorescence

• stellar parallax

• stellar mass

• emission nebulae

Which color stars have the highest surface temperature?

• red

• orange

• yellow

• blue

Which type of star is the sun?

• black hole

• black dwarf

• main sequence

• red giant

What happens to a sun-like star after it has used up all the fuel in its core?

• supernova

• neutron star

• red giant

• nebula

Stars that are composed of matter in which electrons have combined with protons are called

• black holes

• neutron stars

• red giants

• white dwarfs

Which object has such a strong surface gravity that light cannot escape it?

• black hole

• black dwarf

• red giant

• white dwarf

Hubble's law states that galaxies are retreating from Earth at a speed that is proportional to their

• distance from Earth

• volume

• mass

• temperature

What theory states that the universe began in a violent explosion?

• the big crunch

• the Doppler effect

• Hubble's law

• the big bang