| Scienceray > Astronomy |
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A-z with Astronomy |
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by Tina68, May 2, 2007 |
Learn a little about astronomy. |
- A is for Asteroid. An asteroid is a small, generally rocky, solid body orbiting the Sun.
- B is for Black Hole. The Black Hole is an object whose gravitational attraction is so strong that its escape velocity equals the speed of light.
- C is for Constellations. Constellations are groups of stars in the night sky.
- D is for Disk. Disk, is the flat, round portion of a galaxy.
- E is for Earth. The Earth is the third planet from the Sun.
- F is for Frequency. Frequency is the number of times per second that a wave vibrates.
- G is for Galaxy. A Galaxy is a massive system of stars held together by their mutual gravitational attraction.
- H is for Horizon. A Horizon is the line that separates the sky from the ground.
- I is for Inner Core. The innercore is the innermost part of a planet.
- J is for Jupiter. Jupiter is the fifth planet from the Sun.
- K is for Kepler's Laws. These are laws that describe the motion of planets around the Sun.
- L is for Lunar Eclipse. A Lunar Eclipse happens when the Earth passes between the Sun and The Moon, and the Earth's shadow falls on the Moon.
- M is for Moon. The Moon is a satellite of the planet Earth.
- N is for Neptune. Neptune is the eighth planet from the Sun.
- O is for Orbit. An orbit is the path in space followed by a celestial body.
- P is for Pluto. Pluto is the Ninth planet from the Sun.
- Q is for Quasar. Quasars are the most luminous and most distant objects known to astronomers.
- R is for Red Giant. The Red Giant is a cool, luminous star whose radius is much larger than the Sun's.
- S is for Saturn. Saturn is the sixth planet from the Sun.
- T is for Telescope. A telescope is an instrument used for observing the Heaven's.
- U is for Uranus. Uranus is the seventh planet from the Sun.
- V is for Venus. Venus is the second planet from the Sun.
- W is for White Dwarf. The White Dwarf is a dense star whose radius is approximately the same as the Earth's.
- X is for X- Ray Binaries. A binary star system in which one of the stars, or the gas associated with a star, emits X-Rays intensely.
- Y is for Year. A Year is the time that it takes the Earth to complete its orbit around the Sun.
- Z is for Zodiac. Zodiac is a band running around the celestial sphere in which the planets move.
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