Universe

A:

Planets travel around the sun in paths called orbits. Each planet has its own orbit around the sun, and one orbit around the sun is called a year. All planets travel in the same direction around the sun.

See Full Answer
Filed Under:
  • What happens after a supernova?

    Q: What happens after a supernova?

    A: Depending on the size of the star before it explodes as a supernova, the core of the star either shrinks back into a tiny neutron star or becomes a black hole. If the star is only a few times bigger than the sun, the core becomes a tiny neutron star. If the star is much bigger than the sun, the chances of it becoming a black hole are much greater.
    See Full Answer
    Filed Under:
  • Who discovered the planet Saturn?

    Q: Who discovered the planet Saturn?

    A: It is impossible to determine who discovered Saturn, as it is one of five planets that are visible without the aid of instruments. Saturn has been widely observed by people for thousands of years, although its unique and complex system of rings are only visible using a telescope.
    See Full Answer
    Filed Under:
  • Do the planets travel around the sun in a path called an orbit?

    Q: Do the planets travel around the sun in a path called an orbit?

    A: Planets travel around the sun in paths called orbits. Each planet has its own orbit around the sun, and one orbit around the sun is called a year. All planets travel in the same direction around the sun.
    See Full Answer
    Filed Under:
  • Why do some stars appear brighter than others?

    Q: Why do some stars appear brighter than others?

    A: The apparent brightness of a star viewed from Earth varies based both on the type of star and its distance from the planet. The apparent magnitude differs from a star's absolute magnitude, which describes its brightness from a set distance, rather than the varying distances of stars seen from Earth. The lower the apparent magnitude, the brighter the star is as seen from Earth.
    See Full Answer
    Filed Under:
  • What is the temperature of a black hole?

    Q: What is the temperature of a black hole?

    A: According to NASA, the temperature of a black hole with the mass of the sun is only one ten-millionth of a degree over absolute zero. Scientists determine this by measuring the temperature of the radiation that comes from a black hole.
    See Full Answer
    Filed Under:
  • Why did people once believe that Earth was the center of the Universe?

    Q: Why did people once believe that Earth was the center of the Universe?

    A: The belief of early astronomers that the Earth was the center of the universe stemmed from limited astronomical tools and geocentric attitudes. The Ptolemaic Model, developed around 100 A.D., presented the Earth-centered solar system in which most early Roman astronomers believed.
    See Full Answer
    Filed Under:
  • How many modern constellations are there?

    Q: How many modern constellations are there?

    A: As of 2014, there are 41 modern constellations, which are constellations added to the catalogue after 1600. Four of them, Carina, Puppis, Pyxis and Vela are derived from Argo, a constellation catalogued by Ptolemy.
    See Full Answer
    Filed Under:
  • What are some facts about the Aurora Borealis?

    Q: What are some facts about the Aurora Borealis?

    A: Aurora Borealis occurs when materials from the surface of the Sun collide with the atmosphere of the Earth. Experts make predictions about the occurrence of Aurora Borealis based on events taking place on the Sun and the speed of matter being thrown from the Sun's surface. Aurora Borealis is visible in portions of the Northern Hemisphere, including Canada, Scandinavia, North America, Siberia and Northern Europe.
    See Full Answer
    Filed Under:
  • Q: Are humans alone in the universe?

    A: Whether humans are the only intelligent life to have evolved in the universe cannot be answered with certainty, but a probability can be assigned to the proposition. Accurately estimating the number of advanced civilizations in existence is done by assessing the number of opportunities for intelligent life to evolve and contrasting that with the improbability of various stages in the development of a civilization.
    See Full Answer
    Filed Under:
  • Q: How many atoms are in the universe?

    A: In the observable universe, scientists estimate that there are possibly 10 quadrillion vigintillion and 100,000 quadrillion vigintillion atoms, according to Universe Today. The number of atoms in the universe beyond what is known is not calculable.
    See Full Answer
    Filed Under:
  • Q: How do you make a model of a solar system?

    A: One of the easiest ways to make a model of a solar system is to cut circles from cardboard to represent the planets and hang them in orbits from a larger circle. Use nine circles to represent the eight planets and the sun.
    See Full Answer
    Filed Under:
  • Q: What is the function of the solar plexus?

    A: The solar plexus, or celiac plexus, is a large cluster of nerves that relay messages from the major organs of the abdomen to the brain. These organs, called visceral organs, are important to metabolism and to general life functioning. The solar plexus monitors them and makes sure they are functioning correctly.
    See Full Answer
    Filed Under:
  • Q: What is Galileo Galilei famous for?

    A: Galileo Galilei is famous for his physics-related and astronomy-related observations. He built his own telescope in 1609 and used it to study the cosmos, eventually concluding that Earth’s solar system is heliocentric. Galileo’s theories on motion were later used as the foundation of Isaac Newton’s work.
    See Full Answer
    Filed Under:
  • Q: Why can't we see past the cosmological horizon?

    A: It's impossible to look beyond the cosmological horizon because this horizon represents the distance that light has traveled since the big bang. The cosmological horizon exists because the speed of light is constant and all electromagnetic waves travel at the same speed. Therefore, the cosmological horizon holds for visible light as well as for other types of waves, such as radio or microwaves.
    See Full Answer
    Filed Under:
  • Q: What are some world facts?

    A: Observed from space, the United States is the brightest country on the brightest planet in the Solar System because Earth's water makes it the brightest planet and the United States is abundant in artificial lighting, especially at night. Russia is the largest country in the world, Vatican City is the smallest country, and 39 million Vatican Cities could fit inside Russia. In 2011, the global population topped 7 billion people and is expected to reach 10.5 billion by 2050.
    See Full Answer
    Filed Under:
  • Q: What is the ultimate fate of an open universe?

    A: Although the ultimate fate of the universe is a largely debated topic, according to the University of Tennessee, in an open universe the universe will continue to expand forever. This is due to insufficient mass to cause the expansion to stop.
    See Full Answer
    Filed Under:
  • What color is the universe?

    Q: What color is the universe?

    A: When gazing at the starry night sky, you might imagine that the color of the universe is a dark shade of midnight blue. However, the average color is much brighter than that. When all of the universe’s light is averaged together, the resulting color is a much less mysterious light beige.
    See Full Answer
    Filed Under:
  • Q: How do you explain the Big Bang Theory to kids?

    A: Explain the Big Bang Theory to kids using simple terminology and metaphors they can understand to help them relate the new concepts to concepts they already know. For example, remind them that one year is the amount of time it takes to get from one birthday to the next to help them understand just how long ago it was 14 billion years ago, when scientists believed the big bang occurred.
    See Full Answer
    Filed Under:
  • Q: What is Ptolemy's universe theory?

    A: Greek philosopher Claudius Ptolemy believed that the sun, planets and stars all revolved around the Earth. This belief gave way to the ancient Greek theory of a geocentric or Ptolemaic model of the universe. "Geocentric" refers to the belief that the Earth is the center of the universe.
    See Full Answer
    Filed Under:
  • Q: What are the types of black holes?

    A: The universe contains three different categories of black holes: stellar, supermassive and miniature, which are further divided according to whether they are spinning. Non-spinning black holes are always spherical, while spinning black holes tend to be more oblate. The degree of equatorial bulge is determined only by the rotational velocity of the object.
    See Full Answer
    Filed Under:
  • Q: How do you know the world might be ending?

    A: Scientists postulate that the end of the world could stem from a variety of sources, including destruction by meteor, overpopulation and war that affects the entire globe. Dysgenics, or the possible decay of human genes, nuclear warfare and climate change are other scenarios that scientists study and that may predict the end of the human species. Although some scenarios include the end of both the planet and the human race, others suggest that the planet and other forms of life are likely to continue to exist following the extinction of humans. A global pandemic, possibly due to a virus or an antibiotic-resistant bacteria, is thought to be the only cause of extinction that would affect humans alone.
    See Full Answer
    Filed Under: