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100
An imaginary pattern of stars in the sky.
What is constellation
100
The blue-white hot core of a star that is left behind after its outer layers have expanded and drifted out into space.
What is white dwarf
100
A rapidly spinning neutron star that produces radio waves.
What is pulsar
100
A galaxy shaped like a round or flattened ball, generally containing only old stars.
What is elliptical galaxy
200
An instrument that separates light into colors and makes an image of the resulting spectrum.
What is spectrograph
200
The small, dense remains of a high-mass star after a supernova.
What is neutron star
200
A star system with two stars.
What is binary star
200
A galaxy that does not have a regular shape.
What is irregular galaxy
300
The distance that light travels in one year, about 9.5 million million KM.
What is light-year
300
An object whose gravity is so strong that nothing, not even light, can escape. .
What is black hole
300
A binary star system in which one star periodically blocks the light from another.
What is eclipsing binary
300
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
What is galaxy
400
The apparent change in position of an object when seen from different places.
What is parallax
400
A contracting cloud of gas and dust with enough mass to form a star.
What is protostar
400
A star cluster that has a loose, disorganized appearance and contains no more than a few thousand stars.
What is open cluster
400
An enormously bright, distant galaxy with a giant black hole at its center.
What is quasar
500
A large cloud of gas and dust in space, spread out in an immense volume.
What is nebula
500
The brilliant explosion of a dying super-giant star.
What is supernova
500
A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern.
What is spiral galaxy
500
All of space and everything in it.
What is universe
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