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How Big is the Universe?
June 06, 2017 | ReferenceBased on what we can observe, the universe appears to be almost 28 billion light-years in diameter. However, it is far larger than that.
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Solar System Planets: Order of the 8 (or 9) Planets
June 02, 2017 | ReferenceThere used to be nine planets. Now there are eight, or maybe there are nine after all. Whichever you prefer, here is a list of them in the order they appear in the solar system.
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X-37B: The Air Force's Mysterious Space Plane
June 02, 2017 | ReferenceA look at the U.S. Air Force's unmanned X-37B space plane, which has flown four secret, long-duration missions in Earth orbit to date.
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How Far Away is Jupiter?
May 31, 2017 | ReferenceThe distance to Jupiter from Earth varies because of the planets' elliptical orbits.
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Voyager 1: Earth's Farthest Spacecraft
May 31, 2017 | ReferenceVoyager 1 is farther away than any other spacecraft from Earth.
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New Horizons: Exploring Pluto and Beyond
May 30, 2017 | ReferenceThe New Horizons spacecraft reached the dwarf planet Pluto in July 2015.
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Laika the Dog & the First Animals in Space
May 30, 2017 | ReferenceWhat was the first animal in space? The answer may have you buzzing.
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Chuck Yeager: First Person to Break the Sound Barrier
May 30, 2017 | ReferenceChuck Yeager was an American test pilot who was the first person to break the sound barrier — the point where a speeding object (such as an airplane) passes the speed of sound.
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Spacecraft Galileo: To Jupiter and Its Moons
May 25, 2017 | ReferenceGalileo was the first space probe to spend years observing the planet Jupiter and its moons
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Sagittarius Constellation: Facts About the Archer
May 24, 2017 | ReferenceThis large constellation contains the most stars with known planets. It is the 15th largest constellation overall.
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