Planets

A:

The next planetary alignment will not occur until the year 2854. According to astronomers, such alignment typically occurs every 1500 years, with the last phenomenon appearing in 561 B.C.

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  • What are the diameters of the planets?

    Q: What are the diameters of the planets?

    A: The diameters of the planets are as follows: Mercury is 3,032 miles; Venus is 7,521 miles; Earth is 7,926 miles; Mars is 4,222 miles; Jupiter is 88,846 miles; Saturn is 74,898 miles; Uranus is 31,763 miles; Neptune is 30,778 miles. As a result, the largest planet by diameter is Jupiter and the smallest is Mercury.
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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 is the fastest moving planet in the solar system?

    Q: What is the fastest moving planet in the solar system?

    A: The fastest-moving planet in the solar system is Mercury. The planet whizzes around the sun at an orbital velocity of 1.6 times that of Earth's orbital velocity. This amounts to 107,700 miles per hour.
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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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  • How many miles is Jupiter from the sun?

    Q: How many miles is Jupiter from the sun?

    A: Jupiter is located an average of 483.64 million miles from the sun. The exact distance between Jupiter and the sun varies depending on the location of Jupiter along its orbit.
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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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  • 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 the nine planets in order?

    Q: What are the nine planets in order?

    A: The nine planets in order are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and, if it's still considered the ninth planet, Pluto. However, not only has Pluto been demoted to a dwarf planet by some astronomers, but its orbit is so eccentric that there are times when it's closer to the sun than Neptune.
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  • 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.
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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 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.
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  • How many moons does Neptune have?

    Q: How many moons does Neptune have?

    A: Neptune has 13 confirmed moons and one provisional moon. The first discovery of a Neptune moon occurred on Oct. 10, 1846, a mere 17 days after the discovery of the planet itself. The first moon identified orbiting Neptune is Triton.
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  • Does Mars have clouds?

    Q: Does Mars have clouds?

    A: Mars indeed does have water ice clouds, similar to Earth's cirrus clouds, both high in the atmosphere and often forming as icy fog just above the ground surface. The Viking orbiter was able to capture sunrise pictures during which an icy fog was rising from within Martian craters.
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  • Have any man-made satellites been sent to Mars?

    Q: Have any man-made satellites been sent to Mars?

    A: Several man-made satellites have been sent to Mars since 1964. The first spacecraft to Mars, known as Mariner 3, was launched on Nov. 5, 1964. This spacecraft malfunctioned and failed to fly by Mars as planned.
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  • What is the hottest planet in the solar system?

    Q: What is the hottest planet in the solar system?

    A: Venus, the second planet from the sun, is the hottest planet in the solar system, with surface temperatures of around 864 degrees Fahrenheit, and there is no difference between day and night temperatures on Venus, so there is no time of day where temperatures tend to dip. This high temperature, which is hot enough to melt tin and lead, is due in part to the planet's proximity to the sun, though Venus manages to be much hotter than Mercury, which is the closest planet to the sun. Venus' extreme heat can be attributed mostly to its extremely thick atmosphere, which is 93 times thicker than Earth's atmosphere and composed mainly of carbon dioxide.
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  • What was Mercury named after?

    Q: What was Mercury named after?

    A: The planet Mercury was named by the Romans after their messenger god, Mercury. Mercury travels the fastest around the Sun, so it was fitting that they chose the god whose hat and shoes were winged, enabling him to move swiftly through the skies. The element known as Mercury was named after the planet.
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  • What is the surface temperature on planets?

    Q: What is the surface temperature on planets?

    A: The surface temperatures of the solar system's planets are dependent on how close each planet is to the sun. Planets that have atmospheres are better able to retain heat from the sun, affecting the planet's surface temperature.
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  • 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.
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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 Neptune sustain human life?

    Q: Can Neptune sustain human life?

    A: Neptune, the eighth planet from the sun, cannot support life according to NASA. Being so far from the sun makes Neptune a very cold planet, with temperatures reaching as low as -361.
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  • How did Jupiter get its name?

    Q: How did Jupiter get its name?

    A: Jupiter gets its name from the most powerful god in Roman mythology. The king of all other gods, Jupiter is the equivalent of Zeus in Greek mythology. It was the largest visible object in the night sky during the time of the Roman Empire, and thus named after its most important deity.
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