31.3 Flashcards
Galaxy
large group of stars dust and gas held together by gravity
Milky Way
The galaxy our solar system is in
Local Group
a group of galaxies containing the milky way galaxy
cosmology
the study of how the universe was made
big bang theory
a theory that states all matter and energy in the universe were compressed into a single point which began to expand about 13.7 years ago (not a explosion)
cosmic background radiation
residual microwave radiation emitted when the universe was very young
dark matter
invisible form of matter that does not emit any detectable electromagnetic energy of its own
dark energy
an invisible form of energy that creates a repulsive force causing the universe to expand at a faster rate
what are the three ways a galaxy can be made
spiral elliptical irregular
what kind of galaxy is the milky way
spiral
how many galaxies are in the local group
about 50
what are the two largest galaxies in the local group
Andromeda and milky way 🌌
