The Universe and Its Stars

What is wavelength and why are we talking about it in this unit?

• All stars emit light. That light travels in waves.

• Wavelength is the distance between peaks in a light wave

• All visible light (the colors that we see) have different wavelengths

• All the above

What is the best evidence for the Big Bang theory?

• How fast light can travel

• The expansion of the Universe

• Creation of new planets

• Billions of galaxies being found far away from Earth

In red shift, the galaxies appear red in color because they are...

• far away from Earth

• close to Earth

• MOVING farther away from Earth

• MOVING closer to Earth

What are the two elements that all planets are mostly made up of?

• Carbon and Oxygen

• Hydrogen and Helium

• Hydrogen and Oxygen

• Nitrogen and Oxygen

How does the elemental composition of the stars support the idea of the big bang theory?

• All stars have a ratio of 3:1 hydrogen to helium showing all stars were made at the same time

• All stars are made of different elements, showing that they were made at different times

• All stars are found in the same galaxy

• All stars appear red proving they are made of the same elements

How can cosmic background radiation be used as evidence for the big bang?

• There are many different types of radiation present throughout the entire universe

• The stars formed in the same ratio of about 75% Hydrogen and 25% Helium

• As galaxies move away from Earth, they appear red.

• Energy in form of microwave radiation is evenly spread throughout universe. This means it started at one spot and moved outwards

Throughout out a star's lifetime, it undergoes reactions to create energy. What reaction do stars undergo to create energy?

• Chemical Reactions

• Nuclear Fission of Helium

• Nuclear Fusion of Hydrogen

• Nuclear Fusion of Helieum

Which of the following is true about a star's lifespan?

• All stars live for the same amount of time and go through the same stages

• Larger stars live longer than smaller stars

• Smaller stars live longer than larger stars

• Average sized stars live the longest

Why do smaller stars live longer than larger stars?

• Nuclear Fusion happens faster in larger stars

• Smaller stars travel farther distances

• Larger stars are made of more hydrogen than smaller stars

• Nuclear Fusion happens faster in smaller stars

Which of the following will happen to a small star as it dies?

• Small stars turn into Red Giants and then explode

• Small stars will supernova and turn into black holes

• Once small stars run out of energy, they will turn into white dwarfs

• Small stars will explode and then turn into white dwarfs