Telescopes
Scale of the Universe
Characteristics of Stars
Lives of Stars
Star Systems and Galaxies
100
Electromagnetic radiation that is visible to the human eye
Visible Light
100
This is made up of all of space and everything in it.
Universe
100
The region of the H-R diagram that most stars fall within is the _________
Main sequence
100
No electromagnetic radiation escapes from a _________ ________, so astronomers locate them by looking for X-Rays from gas accelerating toward them.
Black hole
100
This galaxy is small with many bright young stars, lots of gas and dust, and has no definite shape.
Irregular galaxy
200
Instrument that collects and focuses electromagnetic radiation.
Telescope
200
A light-year is a measure of ________
Distance
200
A device that breaks light into colors and produces an image of the spectrum is a(n) _________
Spectrograph
200
An explosion that occurs at the end of a massive star's life is a(n) _________
Supernova
200
This type of galaxy creates new stars in the arms.
Spiral galaxy
300
Type of telescope that uses a curved mirror to gather and focus light.
Reflecting telescope
300
Astronomers use this to measure the distance to stars that are within several hundred light-years of Earth.
Parallax
300
A star's brightness viewed from Earth regardless of distance is its ______________
Apparent brightness
300
A(n) ___________ is a large cloud of gas and dust in space.
Nebula
300
This type of galaxy is mostly old stars, without a lot of active star formation.
Elliptical galaxy
400
Optical telescope that uses convex lenses to gather and focus light.
Refracting telescope
400
The distance light travels through space in a year is one _______
Light-year
400
The brightness of a star viewed from a standard distance from Earth is the _____________
Absolute brightness
400
A low or medium mass star becomes a(n) _______ at the end of its life.
White Dwarf
400
This type of star cluster has more new stars that are spread out.
Open cluster
500
This is the building that houses telescopes.
Observatory
500
Parallax is the apparent change of ________ of an object when you look at it from different places.
Position
500
The H-R in the H-R diagram stands for ___________ ____________
Hertz-Russell
500
A(n) _________ forms from the leftover material from a supernova; it may contain as much as three times the mass of the sun.
Neutron Star
500
A(n) _______ is an active, young galaxy with a giant black hole at the center.
Quasar
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