Flash Cards

Review of three galaxies

Term Definition
Milky way Spiral shaped galaxy that we live in
Galaxy A massive collection of stars, dust and gas held together by gravity
Approximate age of the universe 13.5- 14.5 billion years
Gravity A pull force that holds the planets in orbit around the sun
Stellar Region group of neighboring stars
Andromeda Closest galaxy to the milky way. It is 2 Billion light years away
Fusion Combining two small nuclei to form a large nucleus.
Big Bang Theory The accepted scientific theory of how the universe was formed from a big explosion which caused matter to fly apart
E=mc2 Albert Einstein's equation which explains that you only need a small amount of matter to make lots of energy.
Hubble's Law A law that supports that the universe is expanding. It states that objects further away move away faster and appear red; Objects that are closer appear blue.
Doppler Effect (Redshift) Objects moving toward us look blue, have short wavelengths, high energy, and high frequency

Objects moving away from us look red, have long wavelengths, low energy, and low frequency

Hydrogen First element created 1 sec after the big bang. Only element that can withstand such extreme temperature. It is the simplest to make with 1 proton, 1 neutron, and 1 electron.
Helium This element formed 3 minutes after the big bang. it is the second element
Spiral Galaxy This type of galaxy has a lot of gas and dust and is the youngest galaxy
Elliptical Galaxy This type of galaxy has no gas and dust, has a sphere shape, is the oldest galaxy, and is made of all old stars
Irregular Galaxy This type of galaxy, had no definite shape, little dust and gas, and have mostly old, but some young stars.
As the universe expands… …it cools and decreases in energy
Hydrogen, Helium, Lithium 1st 3 elements created after big bang
Strong Nuclear Force What is weakened by extreme heat?
Hydrogen & Helium What are the most abundant (common) elements?
Heavy Elements What type of elements form under cooler temperatures?
Gamma Radiation What type of radiation was evident at the Big Bang?
Microwaves What type of radiation is evident today?
Decreases The universe cools as it expands. What happens to energy as the universe cools?

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