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Terms
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- A
- A
- cosmos
- universe
- asterism
- a group of stars
- planet
- large, dark, celestial body
- International Astronomical Unit
- a group promoting the science of astronomy in all aspects
- magnitude
- distance from earth
- constellation
- a pattern of stars
- galaxy
- a large system of stars
- star cluster
- groups of stars gravitationally bound all have the same age and origin
- nebula
- an interstellar cloud of dust, hydrogen gas and plasma
- astronomical unit
- a unit of length based on the distance from the earth to the sun 93 million miles
- How many minutes does it take for the sun to reach Earth?
- 8.5 minutes
- optical telescope
- visible light
- radio telescope
- objects that emit powerful radio waves but little visible light from sun to see behind dust clouds of Milky Way
- infrared telescople
- special heat detector air thin sources relatively cool stars
- What is astronomy?
- the scientific study of celestial objects and phenomena that originate from outside the Earth's atmosphere
- Galactic Year
- the duration of time required for the solar system to orbit once around the center
- polaris
- brightest star in Ursa Minor
- Meteor
- the visible event when a meteoroid or asteroid enters the Earth's atmosphere
- meteoroid
- a small sand to boulder sized particle of debris in the solar system, remnants of comets
- meteorite
- a portion of the meteoroid or asteroid that survives its passage and impacts the ground without being destroyed
- terrestrial planet
- a planet primarily made up of silicate rocks
- giant planet
- a large planet not primarily composed of solid matter
- sidereal day
- a time interval measuring earth's rotation around the axis in one day
- celestial sphere
- the imaginary rotating sphere of gigantic radius
- eclipse
- the event that occurs when one celestial objects moves into the shadow of another
- white dwarf
- small star composed mainly of electron-degenerate matter hot dense electrons and nuclei
- neutron star
- remnants of a massive star that went nova, veryy dense
- Orion Arm
- a minor spiral arm of the Milky Way Galaxy
- local group
- group of galaxies that includes our galaxy
- Virgo Cluster
- a cluster of galaxies in the constellation Virgo
- Elliptical Galaxy
- spherical, no arms mostly old stars
- Spiral Galaxy
- disk shaped with a greater concentration of stars near their centers has arms old and young stars young stars are in the arms
- Irregular Galaxy
- stars spread unevenly, young stars
- Milky Way has ____ stars.
- 100-200 billion
- supercluster
- webs of many stars across the universe
- Hubble's Law
- Galaxies are moving away from Earth with a speed proportional to their distance