31.3 31.4 vocab Flashcards
A large group of stars, dust, and gas held together by gravity.
Galaxy,
The galaxy we live in.
Milky Way
The Milky Way is a in a group of Galaxies called?
Local Group
The study of how the universe began, and how it changes.
Cosmology
all matter and energy in the universe were composed into a single point.
Big Bang Theory
residual microwave radiation emitted when the universe was very young.
Cosmic Background Radiations
an invisible form of matter that doesn’t 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 a faster rate.
Dark Energy
What are the three shape groups of galaxies?
spiral, elliptical, irregular.
which galaxy is our solar system located in?
Milky way galaxy
what shape is the Milky way galaxy?
Spiral galaxy
Galaxies that aren’t elliptical or spiral are what?
Irregular Galaxies.
about how many galaxies are in the local group?
50 Galaxies.
how long ago did the big bang event happen?
13.7 billion years ago.
what is the name of the effect that shows a change in light wave lengths?
The Doppler effect.
