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