Solar System
Terms
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- Orbit
- Path followed by an object moving under control of another objects gravity force.
- Black hole.
- A massive object so dence that no light can escape it.
- Protostar
- Regions of dense matter that may contrast forming spiining balls of gas and dust that form the early life of a star.
- AU
- The distance from earth to the sun.
- Spiral glaxy
- a galxy that looks like a pinwheel. Arms of gas and dust.Our galaxy is this.
- Local group
- Group of more than 2 dozen galaxies.
- Irregular galaxy
- No regular pattern. Least common.
- Neutron star
- A star mostly made of neutrons. Dense spins fast...Like speed racer.
- Absolute magnitude
- A mesure of a stars true brightness.
- Galaxy
- A bunch of starts, gas, and dust.Held together by gravity.
- Terrestrial planets
- The inner rockey planets. Mercury, Venus, Earth, and Mars.
- Elliptical galxy
- A galaxy shaped like a football. Most common.
- White dwarf
- A small hot white star found in th lower left of the HR diagram.
- Fusion
- The combining of Hydrogen atoms into helium atoms: the main source of energy from a star.
- Satellite
- A small objectthat orbits a larger one.
- Solar system
- Stars planets commets and everything else around the sun.
- Star
- Shines. Self-luminous.
- Constellation
- A grouping of stars named by astronaomers based on the shape and grouping.
- Gaseous giants
- Large gas planets in out solar system. Jupitar, Saturn, Uranus, and Neptune.
- Supernova
- The violent explosion of a large star that ends its life.
- Light year
- Distance light can travel in a year.
- Nebula
- Large cloud of dust and gas gravitational forceon each other causing the cloud to contract and temperature to rise causing fusion.
- Milky way
- Our galaxy.
- Apparent brightness
- The brightness of a star as it appears from earth.
- Red giant
- A cool but large red star found in the upper right corner of the HR diagram.
- Planet
- A non luminus object illuminated by light from a star. Such as our sun around which this revolves.