Astronomy
27 August 2008Solar Eclipse:
Celestial event during which the new Moon passes directly between the Earth and Sun, temporarily blocking the Sun’s light.
Lunar Eclipse:
A darkening of the moon caused by the passing of the earth between the sun and the moon. Lunar eclipses always happen during the full moon phase.
Universe:
The Universe is most commonly defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them.
Sun:
The sun as a unit of solar energy concentration. It is the star that is the source of light and heat for the planets in the solar system; The sun contains 99.85% of the mass in the solar system.
Star:
A celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior.
Meteoroids:
They are pieces of matter moving through the solar system. Meteors are the flashes of light they produce when entering the earth’s atmosphere.
Comet:
Comets are small Solar System bodies that orbit the Sun and, when close enough to the Sun, exhibit a visible coma (or atmosphere) and/or a tail — both primarily from the effects of solar radiation upon the comet’s nucleus.
Asteroids:
Also known as the minor planets, are small bodies orbiting the Sun that resemble planets. More than 5,000 asteroids have been discovered.
Planets:
It is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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