Download Galaxies and the Big Bang Theory

Name: __________________________________________
Galaxies and the Big Bang Theory
Galaxies
A _______________ _________________ is a device used to
detect long radio waves from objects in space.
A ___________ is a huge group of single stars, star systems, star
clusters, dust, and gas bound together by gravity
The three different types of galaxies that exist in our universe are:
•
•
•
Spiral Galaxies
The shape of a spiral galaxy is a bulge in the middle and arms that
spiral outward like ______________.
•Many bright, young stars
•Spiral galaxies contain ____________ and _____________.
Elliptical Galaxies
•Look like _______________ or __________________
______________.
•Billions of stars
•Contain very little _________ and ________ between stars.
•Old stars because little gas or dust and no stars are forming any
longer.
Irregular Galaxies
•Galaxy without a _____________
________________.
•Smaller than other galaxies
•Many bright, young stars
•Lots of gas and dust to form new stars
Milky Way
•Our solar system is located in a __________
called the Milky Way.
___________
The Expanding Universe
•____________
_______________ Theory
–Universe formed in an instant
–Billions of years ago
–Enormous explosion
•Universe is expanding
–Leftover thermal energy from the big bang is _______________
_______________
_________________________
Evidence that supports the Big Bang Theory: