Planets

A:

A dwarf planet is a celestial body that orbits the sun and is large enough to assume a round shape but has not cleared its orbital path of similar objects. There are five known dwarf planets as of 2014: Pluto, Ceres, Eris, Haumea and Makemake.

See Full Answer
Filed Under:
  • How much would a 100 pound person weigh on Neptune?

    Q: How much would a 100 pound person weigh on Neptune?

    A: A 100-pound person who stood, or floated, on the surface of Neptune would weigh 114 pounds. Although Neptune is much more massive than Earth, it's far less dense, so the acceleration of gravity at its surface is weaker than expected for a planet that is 17 times Earth's mass.
    See Full Answer
    Filed Under:
  • What is the average surface temperature of Neptune?

    Q: What is the average surface temperature of Neptune?

    A: The average surface temperature on Neptune is minus 329.8 degrees Fahrenheit, close to its effective temperature of minus 353 degrees Fahrenheit. Neptune is among the coldest planets in the solar system.
    See Full Answer
    Filed Under:
  • How can you memorize the order of the planets?

    Q: How can you memorize the order of the planets?

    A: A popular way to memorize the order of the planets is to use a mnemonic device, such as "My Very Educated Mother Just Served Us Nachos," as suggested by the International Astronomical Union. "My" is Mercury, "Very" is Venus, "Educated" is Earth, "Mother" is Mars, "Just" is Jupiter, "Served" is Saturn, "Us" is Uranus and "Nachos" is Neptune.
    See Full Answer
    Filed Under:
  • What is Saturn's mass?

    Q: What is Saturn's mass?

    A: Saturn's mass is 258,326,818,200,000,000,000,000,000 pounds (568,319,000,000,000,000,000,000,000 kilograms). The sixth planet in the solar system and the second largest after Jupiter, Saturn is about 886 million miles away from the Sun. According to the National Aeronautical and Space Authority, Saturn completes one rotation (spinning on its axis) in 10.70 Earth-hours.
    See Full Answer
    Filed Under:
  • Could people live on Saturn?

    Q: Could people live on Saturn?

    A: Saturn would provide a hostile environment for most of the life found on Earth, according to Fraser Cain of Universe Today. It could not be inhabited by humans without extensive protection.
    See Full Answer
    Filed Under:
  • What are the nicknames for the planets?

    Q: What are the nicknames for the planets?

    A: Nicknames for the eight planets in the solar system are Swift Planet for Mercury, Morning Star and Evening Star for Venus, Blue Planet for Earth, Red Planet for Mars, Giant Planet for Jupiter, Ringed Planet for Saturn, Ice Giant for Uranus and Big Blue Planet for Neptune. Pluto was once considered a planet and had the nickname Ice Planet, but it is now classified as a dwarf planet.
    See Full Answer
    Filed Under:
  • Who invented the solar system?

    Q: Who invented the solar system?

    A: The solar system was formed from a massive gas cloud, and layouts were observed and refined beginning in the sixth century B.C.E. by early Greek astronomers. Nicholas Copernicus and Galileo Galilei continued observing the solar system well into the Renaissance era, according to About.com.
    See Full Answer
    Filed Under:
  • Where does it rain diamonds?

    Q: Where does it rain diamonds?

    A: Planetary scientists in the United States believe that giant diamond chunks may be floating in the fluid hydrogen and helium atmospheres of Saturn and Jupiter, and that at certain altitudes the chunks melt and rain glittering liquid diamond onto the planets.
    See Full Answer
    Filed Under:
  • Where did Neptune get its name?

    Q: Where did Neptune get its name?

    A: Shortly after its discovery, Neptune was referred to as "the planet exterior to Uranus." It was also called "Le Verrier's Planet" after one of the men who discovered it, Urbain Le Verrier. He shares the credit with one other man, John Couch Adams. Verrier named the planet Neptune.
    See Full Answer
    Filed Under:
  • What is the difference between a moon and a planet?

    Q: What is the difference between a moon and a planet?

    A: NASA states that for an astronomical body to be considered a moon, that object must orbit a planet. For a planet to be classified as such, it must meet certain strict criteria set by the International Astronomical Union.
    See Full Answer
    Filed Under:
  • Where is the highest temperature on Jupiter?

    Q: Where is the highest temperature on Jupiter?

    A: The highest temperatures on Jupiter are found in its core and are estimated at over 60,000 degrees Fahrenheit. Due to Jupiter's distance from the Sun, most of its heat comes from its core, and the temperature generally decreases moving away from the planet's center.
    See Full Answer
    Filed Under:
  • How many moons does Mars have?

    Q: How many moons does Mars have?

    A: Mars has two moons: Phobos and Deimos. Both moons are irregularly shaped and very small in size compared to the Earth’s moon. Phobos is the larger of the two, with an average radius of 6.9 miles; Deimos has an average radius of only 3.8 miles.
    See Full Answer
    Filed Under:
  • What planet is the "third rock from the sun"?

    Q: What planet is the "third rock from the sun"?

    A: Earth is considered to be the "third rock from the sun." That phrasing is used because Earth is the third planet from the sun, as well as being a terrestrial (rocky) planet.
    See Full Answer
    Filed Under:
  • Would Mars be a good planet to live on?

    Q: Would Mars be a good planet to live on?

    A: As of 2014, scientists believe Mars is the most likely planet in Earth's solar system, outside of Earth, to support human existence. However, this doesn't say much about the potential for life on other planets, as many major obstacles impede life on Mars without significant technological advancements.
    See Full Answer
    Filed Under:
  • What is the length of a day and year on Saturn?

    Q: What is the length of a day and year on Saturn?

    A: A day on Saturn is 10.7 hours, and a year is equivalent to 29 Earth years or 10,832 days. The length of the day is calculated from the planet's rotational speed, while scientists determine the length of a year by observing Saturn's orbit.
    See Full Answer
    Filed Under:
  • What are the sizes of the nine planets?

    Q: What are the sizes of the nine planets?

    A: The nine planets in the solar system range in size from approximately 3,000 to 140,000 kilometers in diameter. Ranked from smallest to largest the planets are Pluto, Mercury, Mars, Venus, Earth, Neptune, Uranus, Saturn and Jupiter.
    See Full Answer
    Filed Under:
  • What are some cool facts about Mars?

    Q: What are some cool facts about Mars?

    A: Mars, the fourth planet from the sun, has interested people for thousands of years, according to BBC News. However, whereas the people of ancient Greece and Rome found Mars fascinating for its red color, people today are more interested in finding water on the planet.
    See Full Answer
    Filed Under:
  • How long does it take the Earth to make one revolution?

    Q: How long does it take the Earth to make one revolution?

    A: Earth completes one revolution around the Sun for every 365.242199 times it rotates on its axis. This figure is, unfortunately, not evenly divisible, which has historically caused difficulties for the creators of various calendars.
    See Full Answer
    Filed Under:
  • What planet has the longest year?

    Q: What planet has the longest year?

    A: As the furthest orbiting planet in the Solar System, Neptune has the longest year, taking 164.8 Earth years to complete a single orbit of the Sun. Prior to its reclassification as a dwarf planet in 2006, Pluto was the planet with the longest year, equal to about 248 Earth years.
    See Full Answer
    Filed Under:
  • What are the names of Mercury's moons?

    Q: What are the names of Mercury's moons?

    A: There are no names for Mercury's moons because the planet does not have any moons. The only other planet that has no moons is Venus.
    See Full Answer
    Filed Under:
  • Where is Mars located in the sky?

    Q: Where is Mars located in the sky?

    A: Mars is the fourth planet from the sun and the seventh largest at 227,940,000 kilometers, according to the University of Central Florida. The size and close proximity of Mars render it visible in the night sky, especially at certain points during its orbit.
    See Full Answer
    Filed Under: