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33 Cards in this Set
- Front
- Back
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Absolute magnitude |
the apparent brightness of a star if it were viewed from a distance, compared to the actual brightness of stars.
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Astronomical Unit |
average distance to earth to sun
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H-R Diagram |
a plot of stars according to their absolute magnitudes
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Apparent Magnitude |
the apparent brightness of a star, how it looks like from earth |
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Black Hole |
a massive star that has collapsed to such a small volume that even light can't escape its gravity
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Clelestial Sphere |
an imaginary sphere of gigantic radius with the earth located at its center.
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Declination |
1. It's like the latitude on Earth
2. Tells you how far a star is from Celestial Equator 3. Measured in degrees up to 0° to -90° |
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Doppler effect |
is when the waves in front of a moving object has high frequency and has lower frequency behind it.
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Electromagnetic Spectrum |
1. Radio 2. Microwave 3. Infrared 4. Visible Light 5. U-V Rays 6. X-Rays 7. Gamma Rays |
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Frequency |
1.The amount of waves pass through in a second 2. High Frequency mean low Wavelength 3. Low Frequency means high Wavelength |
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Fusion |
1.Takes 2 of the same element and joins to make new one 2.Takes place in hot situations3. Releases a lot of energy |
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Gravity |
Is a force that brings us down
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Heat |
happens when energy is released |
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Luminosity |
how bright something is
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Main-Sequence Star |
A star that has turned from a protostar to a star that is releasing energy with fusion
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Mass |
How much matter takes up space
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Matter |
everything
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Meridian |
1. Connects from the NCP to SCP.
2. also crosses zenith |
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Nebula |
a cloud of gas
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Neutron Star |
a spinning star that is left after a supernova |
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Parallax |
the shifting of an object when seen from different positions
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Photon |
when an electron and photon crash, they release a energy or a particle
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Planetary Nebula |
When the outer surface of a red giant fades away it leaves a cloud of gas with the core left over
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Red Giant |
when a main-sequence star runs out of Hydrogen it starts fusing helium together releasing more energy. Which causes boundaries to extend
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Red Shift |
Uses doppler effect. An object moving away from us appears red. Longer Wavelength |
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Revolution |
When Earth circles the sun, a year
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Right Ascension |
1. Is like Longitude from Earth
2. Measured in hours |
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rotation |
When Earth spins on its axis, a day |
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Supernova |
When a giant star ends its Main- Sequence Star Period, huge explosion
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Volume |
Length * Width * Height = VOLUME
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Wavelength |
The distance between the crests of a wave |
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White Dwarf |
The hot core leftover from a average or small star
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Zenith |
the overhead point |
