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