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  1. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › questions

    What is the biggest star we know? - NASA

    Question: What is the biggest star we know? Answer: The largest known star (in terms of mass and brightness) is called the Pistol Star. It is believed to be 100 times as massive as our Sun, and …

  2. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › universe.html

    StarChild: The Universe - NASA

    The universe is a huge wide-open space that holds everything from the smallest particle to the biggest galaxy. No one knows just how big the Universe is. Astronomers try to measure it all the time. They …

  3. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › solar_system.html

    StarChild: The Solar System - NASA

    The Sun is the biggest object in our solar system. It contains more than 99% of the solar system's mass. Astronomers think the solar system is more than 4 billion years old. Astronomers are now finding …

  4. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › sun.html

    StarChild: The Sun - NASA

    The Sun is our closest star. It is a member of the Milky Way galaxy. The Sun is a yellow dwarf star, which means it is a medium size star. It is believed to be over 4 billion years old. The Sun spins …

  5. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › stars.html

    StarChild: Stars - NASA

    A star is a big ball of gas which gives off both heat and light. So where do stars come from? What happens to them as they grow older? A galaxy contains clouds of dust and gas, as well as stars. It is …

  6. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › probes.html

    StarChild: Space Probes - NASA

    It is the biggest and most expensive probe to ever visit another planet. The Cassini spacecraft went into orbit around Saturn in July 2004. It has studied the planet, its ring system, and many of its moons for …

  7. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › questions › archive.html

    Archive of Questions

    Welcome to the archive of Questions & Answers previously featured in the StarChild "Question of the Month" section.

  8. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › eris.html

    StarChild: Eris - NASA

    Eris is the largest known dwarf planet in our solar system. It is a little larger than Pluto. Eris is about 2400 kilometers wide. Eris was first found by a team of astronomers at Palomar Observatory in …

  9. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › makemake.html

    StarChild: The Dwarf Planet Makemake - NASA

    After Eris and Pluto, Makemake is the third largest known dwarf planet. Along with fellow dwarf planets Pluto and Haumea, Makemake is located in the Kuiper Belt, a region outside the orbit of Neptune. …

  10. nasa.gov
    https://starchild.gsfc.nasa.gov › docs › StarChild › mercury.html

    StarChild: The planet Mercury - NASA

    Mercury is only about one-third the size of the Earth. It is smaller than any other planet. Mercury is very close to the Sun and has no substantial atmosphere. These factors contribute to the fact that the …