Reference Pages

  • Large Magellanic Cloud: Nearby Satellite Dwarf Galaxy

    Large Magellanic Cloud: Nearby Satellite Dwarf Galaxy

    April 11, 2014 | Reference

    The Large Magellanic Cloud (LMC) is a satellite dwarf galaxy that is among the closest galaxies to Earth.
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  • What Is the Fermi Paradox?

    What Is the Fermi Paradox?

    April 02, 2014 | Reference

    Where are the aliens? That is the question that the Fermi Paradox seeks to answer. Given our solar system's relatively young age, the theory says that aliens should have visited us already.
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  • How Many Galaxies Are There?

    How Many Galaxies Are There?

    April 01, 2014 | Reference

    Astronomers say there are 100 billion to 200 billion galaxies in the universe. But accurately counting the number of galaxies depends on several factors.
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  • X-37B: The Air Force's Mysterious Space Plane

    X-37B: The Air Force's Mysterious Space Plane

    March 28, 2014 | Reference

    A look at the U.S. Air Force's unmanned X-37B space plane, which has flown three secret, long-duration missions in Earth orbit to date.
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  • Drake Equation: Estimating the Odds of Finding E.T.

    Drake Equation: Estimating the Odds of Finding E.T.

    March 26, 2014 | Reference

    The Drake Equation is used to estimate the number of communicating civilizations in the cosmos, or more simply put, the odds of finding intelligent life in the universe.
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  • What Is The Hubble Constant?

    What Is The Hubble Constant?

    March 21, 2014 | Reference

    The Hubble Constant is the unit of measurement used to describe the expansion of the universe. The cosmos has been getting bigger since the Big Bang kick-started the growth about 13.82 billion years ago.
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  • Kepler Space Telescope: Exoplanet Hunter

    Kepler Space Telescope: Exoplanet Hunter

    March 04, 2014 | Reference

    NASA's Kepler Space Telescope is an observatory in space dedicated to finding planets outside our solar system.
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  • Does the Moon Rotate?

    Does the Moon Rotate?

    February 28, 2014 | Reference

    Yes, the moon rotates on its axis. The moon's rate of rotation nearly matches its orbital period, which keep the same side facing Earth.
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  • What is Space?

    What is Space?

    February 28, 2014 | Reference

    Space is the zone above and around our planet where there is no air to breathe or to scatter light. Space is a vacuum, but it is far from empty.
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  • How Old is Earth?

    How Old is Earth?

    February 27, 2014 | Reference

    Scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.
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