AstronomyDid you know that at the speed of light, we would reach the moon in less than 1 second -- and we'd reach the farthest objects visible to our most powerful telescopes in 13,000,000,000 years! |
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Andromeda Andromeda Galaxy appear asteroid astronomers atmosphere Big Bang black hole brightest brightness celestial sphere clouds clusters collapse color constellations core cosmic craters crust Cygnus dark DATA Diameter discovered disk Earth eclipse energy galaxies gas and dust giant gravity Halley's comet heavenly bodies heavens helium Hubble Space Telescope hydrogen images Jupiter KEY WORDS known latitude layer light light-years look lunar magnetic magnitude main sequence Mars Martian mass Mercury meteorite methane miles Average distance Milky million mirror moon naked eye nebulae Neptune night sky northern Observatory observing open clusters orbit Orion outer particles planet Pluto proplyds pulsars quasars radiation radio waves reflector refractor regions rings rock rotation satellite Saturn shining skies solar system Southern Hemisphere space probe spectral spectrum speed Spins on axis spotted star's stargazing Summer Triangle sun's supergiant supernova surface temperature tiny universe Uranus Venus visible volcanoes Voyager white dwarf