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2. What is the biggest star we know? - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/questions/question21.html

   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 10,000,000 times as bright! In 1990, a star named the Pistol Star was known to lie at the center of the Pistol Nebula in the Milky Way Galaxy.

3. StarChild: The Solar System - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/solar_system.html

   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 new objects far, far from the Sun which they call dwarf planets. Pluto, which was once called a planet, is now called a dwarf planet.

4. StarChild: The Universe - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/universe_level1/universe.html

   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 use a special instrument called a spectroscope to tell whether an object is moving away from Earth or toward Earth. Based on the information ...

5. StarChild: The planet Jupiter - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/jupiter.html

   Jupiter is a large gas planet whose rapid rotation causes the planet to flatten at the poles and bulge at the equator.

6. Do stars last forever? - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/questions/question41.html

   No. Stars are born, live, and die. This process is called the "life cycle of a star". Most of the time a star shines, it is in a stage of its life cycle called the main sequence. How long it stays in the main sequence phase depends on how much mass the star has. Very big stars have a lot of mass to use as nuclear fuel to make it glow. However ...

7. StarChild: The Sun - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/sun.html

   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 slowly on its axis as it revolves around the galaxy. The center, or core, of the Sun is very hot. A process called "nuclear fusion" takes place there.

8. StarChild: The planet Jupiter - NASA

   starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/jupiter.html

   Jupiter is a large gas planet whose clouds change colors daily. This planet is made mostly of hydrogen and helium gases.

9. StarChild: Quasars

   starchild.gsfc.nasa.gov/docs/StarChild/universe_level2/quasars.html

   The word quasar is short for "quasi-stellar radio source". This name, which means star-like emitters of radio waves, was given in the 1960s when quasars were first detected. The name is retained today, even though astronomers now know most quasars are faint radio emitters.

10. Archive of Questions

    starchild.gsfc.nasa.gov/docs/StarChild/questions/archive.html

    What is the biggest star we know? [May 2000] What is space trash? [June 2000] Why does the United States spend so much money on satellites? [July 2000] How do we search for alien life in the universe? [August 2000] What is meant by the "life zone" or the "green zone"? [September 2000] Why do stars twinkle? [October 2000]

11. StarChild: The Dwarf Planet Pluto - NASA

    starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/pluto.html

    Pluto was discovered in 1930 by astronomer Clyde Tombaugh. However, it was not until the year 2015 that we finally got a close-up look at the dwarf planet.