3.3 & 3.4 Flashcards
a large group of stars, dust, and gas held together by gravity
galaxy
a larger group of stars, dust and gas
milky way
the milky way is part of a larger group of galaxies called _________.
Local Group
the study of how the universe began and how it continues to change
cosmology
one of the ways the universe may have formed
big bang theory
residual microwave radiation emitted when the universe was very young
cosmic background radiation
an invisible form of matter that does not emit any detectable electromagnetic energy of its own
dark matter
an invisible form of energy that creates a repulsive force causing the universe to expand at an even faster rate
dark energy
what are the three shapes of galaxies
spiral, elliptical, irregular
about how many galaxies are found in the local group
about 50
how long ago did the big bang happen
13.7 billion years ago
what is the name or the effect when light wavelength changes
The Doppler Effect
what is the universe made up of
Regular matter and Dark matter
