Planets

A:

Earth makes a complete rotation every 24 hours. The Earth spins at 1,036 miles per hour at the equator while remaining near stationary at the poles.

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  • What is the weather on Saturn?

    Q: What is the weather on Saturn?

    A: With an average temperature of minus 288 degrees Fahrenheit and frequent, powerful storms throughout the planet, Saturn is not hospitable to life. Unlike most planets in the Milky Way, Saturn derives its heat from its core rather than from the Sun. The planet is known as a gas giant; it is primarily composed of gases, including hydrogen and molecular helium.
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  • What type of planet is Mercury?

    Q: What type of planet is Mercury?

    A: Like Earth, Mercury is one of four terrestrial planets. It is known as a terrestrial planet because it has a solid ground surface made up of rock and metal. This surface makes Mercury's density very similar to that of the Earth and denser than gas planets, according to Universe Today.
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  • Which planets can be seen without a telescope?

    Q: Which planets can be seen without a telescope?

    A: Mercury, Venus, Mars, Jupiter and Saturn are the five planets that are visible without a telescope. These five planets were known to ancient astronomers long before the invention of telescopes. Some experts also include the Earth on the list of planets you can see with the naked eye.
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  • What is the atmosphere like on Mars?

    Q: What is the atmosphere like on Mars?

    A: According to Space.com, the atmosphere on Mars is around 100 times thinner compared to that of the Earth's and is composed of about 95 percent carbon dioxide. However, the Martian atmosphere is still thick enough to sustain weather, winds and clouds.
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  • What is the most metal-rich terrestrial planet?

    Q: What is the most metal-rich terrestrial planet?

    A: By weight, Earth contains the most metal when compared between the four terrestrial planets of Mercury, Venus, Earth and Mars. The planet Mercury is composed of nearly 70 percent metal, making it the most metal dense.
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  • What are the special features of Mars?

    Q: What are the special features of Mars?

    A: Mars has a number of interesting features that make it one of the most studied planets in the solar system. One of the most often noted features of Mars is its reddish color, which earned it the nickname the Red Planet. The reddish hue results from iron oxide, or rust, in the soil.
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  • 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.
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  • What are types of moons?

    Q: What are types of moons?

    A: There are eight different phases or "types" of the moon: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter and waning crescent. These phases repeat themselves approximately every 29.5 days.
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  • Can Mars sustain life?

    Q: Can Mars sustain life?

    A: According to NASA, 7 billion years ago, Mars may have been an excellent place for microbes to live, but currently it cannot support life because the air is too thin and is comprised mainly of carbon dioxide. After drilling into the rocks on Mars, scientists discovered the key ingredients of life, including sulfur, nitrogen, hydrogen, oxygen and carbon.
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  • How long does it take for Mars to rotate on its axis?

    Q: How long does it take for Mars to rotate on its axis?

    A: It takes Mars 24 hours, 37 minutes, 23 seconds to rotate on its axis. This is almost identical to the amount of time that it takes the Earth to rotate once on its axis.
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  • How much does Saturn weigh?

    Q: How much does Saturn weigh?

    A: Because weight is calculated based on gravitational pull, it is impractical to determine the weight of a planet. For example, an object weighing 500 pounds on Earth weighs 465 pounds on Saturn because of the planets' different gravitational pulls. Thus, planets are compared by calculating their mass, which remains constant.
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  • How much would a 100-pound person weigh on Saturn?

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

    A: A person weighing 100 pounds on Earth would weigh 107 pounds near the poles of Saturn and 91 pounds near Saturn's equator. This difference is due to centrifugal force offsetting some of the pull of gravity along the equator as the planet spins on its axis.
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  • What type of planet is Earth?

    Q: What type of planet is Earth?

    A: According to Encyclopædia Britannica, Earth is classified as a terrestrial planet. A terrestrial planet is rocky, in contrast to the predominantly gas planets found in the outer solar system.
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  • 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.
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  • When will the planets align?

    Q: When will the planets align?

    A: The planets in this solar system never line up perfectly, but they will come into alignment in 2854. Each planet rotates around the sun at a different speed, and the planets form a rough alignment once every 500 years.
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  • What does the word "planet" mean?

    Q: What does the word "planet" mean?

    A: The word "planet" in Greek means "wanderer." Planets were thought to be moving against the still background of stars. The planets move, or revolve, around the sun in relatively fixed orbits.
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  • 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.
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  • Which planet is farthest away from Earth?

    Q: Which planet is farthest away from Earth?

    A: Of the planets in the solar system, Neptune is the farthest away from Earth. Depending on where each planet is in its orbit, Neptune is between 2.7 and 2.9 billion miles away from Earth.
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  • What planets have shorter days than Earth?

    Q: What planets have shorter days than Earth?

    A: The outer planets Jupiter, Saturn, Uranus and Neptune all have shorter days than Earth. Among the terrestrial planets, Mars has a slightly longer day than Earth at 24 hours 37 minutes. Mercury's day lasts 59 Earth days, while a day on Venus lasts 243 Earth days.
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  • What are some facts about the outer planets in our solar system?

    Q: What are some facts about the outer planets in our solar system?

    A: Outer planets of the solar system are made predominantly of gases. They tend to have many more moons than the inner planets, and outer planets take a shorter period of time to rotate around their axes.
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  • What planet has the largest moon?

    Q: What planet has the largest moon?

    A: According to NASA, Jupiter's moon, Ganymede, is the largest moon in the solar system. It has a diameter of 2,631 kilometers. Ganymede is larger than both Pluto and Mercury and is 3/4 the size of Mars. Unlike many other moons, Ganymede has a core that generates a substantial magnetic field.
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