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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, …

  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 …

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

    Olympus Mons - NASA

    Olympus Mons is the tallest mountain in the solar system. Its peak is over 26 kilometers above its base. Olympus Mons is called a shield volcano because of its shape. The volcano is very tall, …

  4. 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 …

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

    StarChild: The Universe - NASA

    The universe is a vast expanse of space which contains all of the matter and energy in existence. The universe contains all of the galaxies, stars, and planets. The exact size of the universe 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 …

  7. 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 …

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

    How old is the universe? - NASA

    Jul 21, 2023 · An alternative approach to estimate is the age of the universe is to measure the "Hubble constant". The Hubble constant (H0) is a measure of the current expansion rate of the …

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

    StarChild: Dr. Stephen Hawking - NASA

    In the 1980s, he returned to an earlier interest in the origins of the universe and how quantum mechanics may affect its fate. He co-authored many publications such as "300 Years of …

  10. 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 …