Stars appear to move in circular paths through the sky because...
the stars orbit Polaris
Earth rotates on its axis
the Milky Way is a spiral galaxy
Earth orbits the sun
A nebula begins the process of becoming a protostar when the nebula...
explodes as a nova
changes color from red to blue
begins to shrink, increase its spin and temperature
develops a red shift
Which of the following choices lists the colors of stars from hottest to coolest...
red, yellow, orange, white, blue
yellow, orange, red, blue, white
orange, red, white, blue, yellow
blue, white, yellow, orange, red
What accounts for different stars being seen in the sky during different seasons of the year?
Earth's rotation on its axis
Earth's revolution around the sun
stellar motion around Polaris
position north or south of the equator
How do stellar spectra provide evidence that stars are actually moving?
dark line spectra reveal a star's composition
Doppler shifts occur in the star's spectrum
light separates into different wavelengths
long exposure photos show curved trails
What happens to main sequence stars (the sun) when energy from fusion is no longer available?
they expand and become supergiants
they collapse and become white dwarfs
they contract and turn into neutron stars
they switch to fission reactions
The number of hydrogen atoms that fuse to form a helium atom is...
four
six
eight
two
Sunspots are regions of...
the core
high temperature
intense magnetism
lighter color
