Light
produced by a hot gas under low pressure, produces a pattern of spaced lines
What is the emissions spectrum?
this element makes up the greatest percentage of most stars
What is hydrogen?
All stars begin their lives here.
What is a stellar nursery?
apparent shift of waves emitted by a moving source
What is the Doppler Effect?
produced when light is passed through a cool gas under low pressure, produces a rainbow with lines missing
What is absorption spectrum?
stars spend the majority of their lives in this region
What is main sequence?
After a star explodes into a supernova it becomes this
What is a neutron star?
According to the theory, the universe began this way
an instrument that separates incoming light by its wavelength or frequency and records the resulting image in some kind of multichannel detector, like a photographic plate
What is spectrograph?
these color stars have the highest temperature
What is blue?
What happens when a star runs out of fuel?
What is it becomes a white dwarf, a neutron star, or a black hole.
this law states that galaxies are retreating from Earth at a speed that is proportional to their distance
What is Hubble's Law?
the brightness of a star as it appears by an observer who is a standard 32.6 light years away
What is absolute magnitude?
the way that stars are classified
What is temperature?
What stage will happen to the sun when it runs out of fuel?
What is a red giant?
What is a parsec?
another name for background noise throughout the universe
What is cosmic background radiation?
The _____________ the number, the greater the apparent magnitude.
What is smaller?
the apparent shift in an object's direction when viewed from two geographically distant locations
a black hole is an area that light cannot escape because this is so strong
What is gravity?
Why do astronomers use scientific notation?
What is to describe sizes and distances in the universe since those numbers are often very large or very small.
shifting of spectral lines that shows an expanding universe
What is the red shift?