Stars are celestial bodies made up of hot gases. Stars radiate energy that comes form thermonuclear reactions. In this section you will learn all about stars and their importance in the universe.


Regulus, the brightest star in the constellation Leo. It is also called Alpha Leonis and Cor Leonis.

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  • 10 Superstitions About Stars

    10 Superstitions About Stars

    These days, we may take the stars for granted, but it's not hard to imagine the wonder early humans must have felt gazing up at those inexplicable points of light. Naturally, superstitions were bound to develop — some more fortuitous than others. See more »

  • Can scientists create a star on Earth?

    Can scientists create a star on Earth?

    Stars are enormous celestial bodies hot enough to register millions of degrees. They're fascinating scientific phenomena, but is it actually possible for scientists to create them? See more »

  • Could a gamma-ray burst wipe out all life on Earth?

    Could a gamma-ray burst wipe out all life on Earth?

    When a huge star collapses, it releases massive amounts of radiation in concentrated streams. If one of those streams hit Earth, it wouldn't be pretty. But where should we put "gamma-ray bursts" on our list of anxieties? See more »

  • Could a planet exist without a host star?

    Could a planet exist without a host star?

    It's not uncommon for planets to wander alone through the universe like big, sullen teenagers. But how do they end up flying solo, and could they still harbor life? See more »

  • Could the power of a neutron star be harnessed?

    Could the power of a neutron star be harnessed?

    Relying on a collapsed star to power our lives on Earth might seem like a good solution to our energy crisis, but there's just one tiny problem: The process might be lethal. See more »

  • How a Supernova Works

    How a Supernova Works

    A dying star can explode with the force of a few octillion nuclear bombs and create any element in the universe. But why do stars go supernova? See more »

  • How are stars formed?

    How are stars formed?

    Long, long ago, our sun began its life as a mere twinkle in the universe's eye. How did it become the ruler of our solar system? See more »

  • How do galaxies form?

    How do galaxies form?

    Galaxies got their start nearly 14 billion years ago, with one unimaginably hot, dense and tiny pinpoint. How did we arrive at the universe's sprawling state of galactic affairs today? See more »

  • How Stars Work

    How Stars Work

    When you look up at night and see thousands of stars, have you ever wondered what you are looking at? Learn what stars are and how they live and die! See more »

  • How the Milky Way Works

    How the Milky Way Works

    A look at the night sky at any time of year will reveal a faint band of light stretching across the sky -- our solar system's home, the Milky Way. How much do we really know about it? See more »

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