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Astronomy: The scientific study
of the Galaxies, Stars, Nebulae, Solar Systems and the
Universe. It deals with a celestial objects
relationship to the Earth, size, position,
composition, motion, evolution and energy.
Astronomers use telescopes, satellites,
computers, space stations and observatories
to study the universe. Universe:The totality of everything in the Space
A Very, Very Big Diamond Out There" Kizaz
holes are formed when stars collapse, and ALL of their mass is condensed into a
super tiny space. It varies with every body of mass. If Earth were to become a
black hole, it would have to be condensed to have a radius smaller than 9 mm."
it takes the Earth one year to make a complete revolution around the sun, it
takes our solar system 230 years to make a revolution around the Milky Way."