Astronomy
Elliptical galaxy
- Contain little gas and dust, bright in the center - Shaped as large 3- dimensional ellipses
List 3 pieces of evidence that support the Biig Bang theory
- Cosmic Radiation- radiation left over from early development of the universe - Redshift- proves that the universe is still expanding outwardly - Energy can turn into matter
Spiral galaxy
- Have spiral arms; made of gas and dust - Most common type of galaxy
Irregular galaxy
- Includes other galaxies that do not fit into the other classifications - Has many different shapes and sizes
Based on the Big Bang theory, how old is the universe?
13 to 15 billion years
Describe the formation of our solar system
A star exploded and formed a disk with matter and dust. Matter collects in the center of the disk and gets hot enough to start nuclear fusion (Sun) . A lot of plants from around the sun which collide to form the 8 planets and the asteriod belt Big Bang --> 4.6 billion years ago
What is galaxy? Where within the galaxy is our solar system located?
Galaxies are large groups of star, gas, and dust held together by gravity. We are on one of the arms of spiral galaxy
If all galaxies began to show blue shifts, what would this change indicate about the fate of our universe?
If all galaxies began to show blue shifts, that means that the galaxies are moving towards us. All the galaxies would smash together into a dense sphere - a reversed big bang would happen
If all galaxies began to show redshifts, what would this change indicate about the fate of our universe?
If all galaxies began to show redshifts, that means that the galaxies are moving away from us. Everything will lose its energy
What evidence indicates that the universe is expanding?
Redshift is the evidence that indicates that the universe is expanding
What are stars made of? How are they born?
Stars are made of ionized gas and dust Stars are formed when gas and dust are drawn together by gravity and nuclear fusion begins (nebula) - the onset of fusion marks the birth of the star
Can we see the shape of the Milky Way while on Earth? Why or why not?
We can't see the shape of the Milky Way while on Earth because we can't see it from the outside
Which type of galaxy do we live in? What is its name?
We live in a spiral galaxy The name of the galaxy that we live in is called the Milky Way galaxy