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