Astronomy

A:

Scientists predict that Halley's Comet, also known as Comet Halley, will make an appearance again in late 2061, early 2062. It was last seen in the sky in 1986.

See Full Answer
Filed Under:
  • What is a burnt-out star called?

    Q: What is a burnt-out star called?

    A: A burnt-out star is called a white dwarf. A white dwarf results after a star’s nuclear fuel burns out, which causes it to collapse or implode. While it has a mass similar to that of the sun, its radius is similar to that of the Earth.
    See Full Answer
    Filed Under:
  • What are meteorites made of?

    Q: What are meteorites made of?

    A: The meteorites that land on earth can be made of stone, iron or stony iron. A few meteorites are made of volcanic glass, but scientists aren't sure that all of these meteorites are extraterrestrial in nature. They believe some of these meteorites are formed when material from an impact crater liquefies and then turns to glass as it's ejected into the atmosphere.
    See Full Answer
    Filed Under:
  • What is the bright object in the western sky?

    Q: What is the bright object in the western sky?

    A: The planet Venus is the brightest object in the western sky. At its brightest, Venus is almost 10 times brighter than Jupiter, the sky's second brightest object.
    See Full Answer
    Filed Under:
  • How do space craters get their names?

    Q: How do space craters get their names?

    A: The International Astronomical Union (IAU), an organization of astronomers, names the craters on planets and moons in the solar system by giving each planet a creative theme. For example, the moon’s craters are usually named for deceased explorers, scientists and scholars, while large craters on Venus are named for famous women in various professional fields.
    See Full Answer
    Filed Under:
  • How does gravity keep us on Earth?

    Q: How does gravity keep us on Earth?

    A: Gravity is one of the fundamental forces of the universe, and it keeps us on Earth because it is relentlessly attractive. Every massive particle exhibits gravity by pulling closer to every other particle. The strength of this interaction is dependent on two quantities: the amount of mass and the distance between objects. It is possible to escape Earth's gravity if you have enough energy to speed up sufficiently.
    See Full Answer
    Filed Under:
  • What is the surface of Mercury made of?

    Q: What is the surface of Mercury made of?

    A: There is not much known about Mercury or its surface, except that it is similar to the moon in appearance and its composition consists of primarily molecular oxygen, sodium and hydrogen. There are also small amounts of helium and potassium. The planet does not have an actual atmosphere, which causes the planet to have extreme temperature changes during its rotation.
    See Full Answer
    Filed Under:
  • What is Jupiter's atmosphere made up of?

    Q: What is Jupiter's atmosphere made up of?

    A: The atmosphere of Jupiter consists of 90 percent hydrogen gas and nearly 10 percent helium. However, its atmosphere has trace amounts of ammonia, sulfur and water vapor. Jupiter is a gas giant that is also the biggest planet in the solar system.
    See Full Answer
    Filed Under:
  • Who named the Milky Way?

    Q: Who named the Milky Way?

    A: Early Greek astronomers named the galaxy "Via Lactea" in reference to the pale band of light formed by stars along the galactic plane. The origin of the name, which translates as "Road of Milk," has been lost to time.
    See Full Answer
    Filed Under:
  • What is the sky made of?

    Q: What is the sky made of?

    A: Four layers of the earth's atmosphere containing various gases make up the composition of the sky. The layers of the atmosphere are divided into the troposphere, the stratosphere, the mesosphere and the thermosphere. The atmosphere's divisions occur according to temperature fluctuations.
    See Full Answer
    Filed Under:
  • What is a planetarium?

    Q: What is a planetarium?

    A: A planetarium is a facility designed to replicate the features of the universe in the night sky. Similar to a museum or science center, planetariums are developed in communities to offer education and entertainment to people curious about the field of astronomy. Visitors typically pay admission fees to enter just as they would at a theater or zoo.
    See Full Answer
    Filed Under:
  • What is an elliptical orbit?

    Q: What is an elliptical orbit?

    A: Elliptical orbits are the paths taken by objects as they fly around a massive object, such as the sun or Earth. Such orbits are not round as is commonly supposed; instead, they orbit the massive body in the shape of an ellipse. Ellipses are like circles that have been elongated slightly, and they are also referred to as ovals.
    See Full Answer
    Filed Under:
  • What is a shooting star?

    Q: What is a shooting star?

    A: Although a shooting star looks like a star shooting across the sky, it's actually a meteor, or small rock that hits Earth's atmosphere. Because of the speed at which the meteor, or meteoroid, is traveling it burns and releases a glow.
    See Full Answer
    Filed Under:
  • Where on the celestial sphere can you look for the planets?

    Q: Where on the celestial sphere can you look for the planets?

    A: The sun and planets follow the ecliptic, an imaginary plane in the celestial sphere tilted approximately 23.5 degrees relative to the celestial equator. Earthbound observers see the sun and planets move along the ecliptic arc, rising up from the east and setting in the west.
    See Full Answer
    Filed Under:
  • What is the purpose of the Hubble space telescope?

    Q: What is the purpose of the Hubble space telescope?

    A: The Hubble Space Telescope was created to capture detailed images or objects that are too far away to be viewed with conventional telescopes. The Hubble's instruments create images that are far superior to those of terrestrial observatories, which suffer from the effects of atmospheric distortion.
    See Full Answer
    Filed Under:
  • How did the constellation Orion get its name?

    Q: How did the constellation Orion get its name?

    A: Stargazers in ancient Greece observed the "pictures" formed by stars and named the Orion constellation after a mythological hunter. Many origin stories exist, but one popular version recounts Orion's quest to defeat a giant scorpion sent by Gaia, the goddess of Earth, according to the Windows to the Universe.
    See Full Answer
    Filed Under:
  • What causes the Cassini division in Saturn's rings?

    Q: What causes the Cassini division in Saturn's rings?

    A: The Cassini Division, a gap in the rings of Saturn, is caused by gravitational pull from Saturn’s moon Mimas. The moon’s gravity affects the tiny particles that make up the rings, creating what looks like empty space. Other divisions in Saturn’s rings are the result of similar interactions with the planet’s moons.
    See Full Answer
    Filed Under:
  • What is the primary purpose of an astronomical telescope?

    Q: What is the primary purpose of an astronomical telescope?

    A: The astronomical telescope is a central apparatus used to study distant planets, stars and moons from the Earth. Astronomer Galileo Galilei famously used the earliest telescopes in 1610 to prove the heliocentric solar system theory put forth by Nicolaus Copernicus in the early 16th century.
    See Full Answer
    Filed Under:
  • What does the full moon symbolize?

    Q: What does the full moon symbolize?

    A: The full moon is said to symbolize different things in various cultures, including the control of water as well as the rhythm of time. The phases of the moon are also used to represent phases of life.
    See Full Answer
    Filed Under:
  • What is the farthest star from Earth?

    Q: What is the farthest star from Earth?

    A: Scientists will never know the farthest star from Earth, as the star is so far away that its light has not, nor will ever, have enough time to reach Earth. Even the stars within the visible universe are far too numerous to count, but the farthest one that humans have ever detected is about 55 million light years away. This incredibly distant star is called SDSS J 122952.66 +112227.8.
    See Full Answer
    Filed Under:
  • How did the solar system form?

    Q: How did the solar system form?

    A: The formation of the solar system began with the creation of the sun after an exploding supernova caused spherical accumulation of dust particles and gas in a huge swirling cloud called nebula. Planets and other components of the solar system formed in the flat plane of the rotating disc of dust.
    See Full Answer
    Filed Under:
  • What is the difference between a solar and lunar eclipse?

    Q: What is the difference between a solar and lunar eclipse?

    A: A solar eclipse occurs when the Moon passes between the Sun and Earth so that the Moon's shadow falls on the Earth. A lunar eclipse occurs when the Earth passes between the Sun and Moon and the Sun casts the Earth's shadow on the Moon. Both events happen only when the Sun, Moon and Earth are aligned. A solar eclipse can only happen during a new moon, and a lunar eclipse can only take place on a full moon.
    See Full Answer
    Filed Under: