click below
click below
Normal Size Small Size show me how
Unit 10/11 Review
Question | Answer |
---|---|
the DISTANCE light travels in a year | light year |
The reason scientists use light years | distances are so great that other units are not practical |
all of space and everything in it | universe |
a cluster of gas, rocks, dust and stars | galaxy |
clouds of dust and gas where stars form | nebula |
the galaxy that Earth is a part of | Milky Way Galaxy |
What type of galaxy is the Milky Way Galaxy? | spiral |
Type of galaxy with a pinwheel shape | spiral |
Type of galaxy that looks like a flatted disc | elliptical |
Where our solar system is located in our galaxy | near the edge,about 26,000 LY from the center |
What is a star made of? | Hydrogen gas fusing to make helium and other elements |
The range of electromagnetic waves in order of increasing frequency | electromagnetic spectrum |
What is red shift? | When a star is moving away from earth, the light emitted will have a longer wavelength and appear more red |
What is blue shift? | When a star is moving towards earth, the color emitted will be more blue because of the shorter wavelength |
What is apparent magnitude? | the brightness of a star as seen from earth |
What is absolute magnitude? | the brightness of a star that is calculated if all stars were the same distance from earth. |
What determines how long a star will live? | Its mass |
A star with more mass will have a ____________ lifetime. | shorter. |
The first stage of a star, when nuclear fusion occurs. | protostar |
The most massive stars will explode - what is this called? | supernova |
What two things can be formed after a supernova? | A black hole or a neutron star |
What is the term for a small or medium size star that flares-up as it runs out of fuel? | Red Giant |
What two things in order will a red giant become? | white dwarf then black dwarf |
What is an HR diagram? | a chart that compares size, temperature and brightness of stars. |
What is a spectrograph? | Device used to determine temperature and chemical composition of a star by breaking the light for a star into its spectrum |
What is the Big Bang Theory? | Theory that says the universe began with an explosion 10 - 15 billion years ago |
How did our solar system form? | About 5 billion years ago, a nebula collapsed to form the sun. Leftover dust became the planets |