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Astronomy Unit 7 Vocab

Across
Extra mass in the universe that hasn't been observed, but has been predicted due to observed gravitational effects
The _____ effect explains how light or sound waves can be stretched or compressed when the source is moving with respect to the observer
One possible candidate for dark matter: Massive compact halo objects
Current explanation for how the universe was formed 13.8 billion years ago
Type of galaxy between spiral and elliptical (has central bulge and disk, but no clear arms)
Type of galaxy without a definite shape, can be the result of two galaxies merging
Type of galaxy that consists of a central bulge with arms extending out from center
Down
An especially bright type of active galactic nuclei (AGN), likely the result of a supermassive black hole at the center of a galaxy
Unknown force that is working against gravity and causing things in the universe to accelerate apart
One possible candidate for dark matter: Weakly interacting massive particles
Type of galaxy that consists of a ball of older, cooler stars
Collection of millions or billions of stars, as well as all the planets, gas and dust between them
Term to describe how light changes when objects are moving away from Earth
Term to describe how light changes when objects are moving toward Earth