6th grade Astronomy

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(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
a collection of star systems
Big Bang Theory
the theory that states that the universe began with a tremendous explosion aout 13.7 years ago
Black Hole
an object so massive and dense that even light cannot escape its gravity
a small rocky object that orbits the sun,usually in a band between Mars and Jupiter
Astronomical Unit
the average distance between the earth and the sun
the tilt of the Earth on its axis
a small body of ice, rock and cosmic dust that follows an ellipitical orbit around the Sun
the study of the origin, properties, processes, and evolution of the universe
the shape of the orbit of the Earth around the Sun
Milky Way
our galaxy – spiral galaxy
period of equal days and nights; the beginning of spring and autumn; Ex. vernal/autumnal equinox;
Twice-yearly point at which the Sun reaches its greatest distance north or south of the equator.
Terristrial planets
solid, rocklike, and dense planets; the inner planets – Mercury, Venus, Earth & Mars
a degenerate neutron star that emits rapid pulses of radio and optical energy
a very luminous, starlike object that generates energy at a high rate; quasars are thought to be the most distant objects in the universe
Light year
the distance light travels in a year
a meteroid that reaches the earth’s surface without burning up completely
Retrograde rotation
the clockwise spin of a planet or moon as seen from above the planet’s north pole
a large cloud of gas and dust in interstellar space. A place where stars are born
Lunar eclipse
the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
Solar eclipse
occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
Red Giant
A large, reddish star late in its life cycle
Spring tide
When the tidal range is greatest. (full moon and new moon)
Neap tide
a less than average tide occurring at the first and third quarters of the moon
Categories: Astronomy