Astronomy test 2 quizlet

  • How many stars are in our galaxy quizlet?

    Stars range in size from neutron stars, which can be only 12 miles (20 kilometers) wide, to supergiants roughly 1,000 times the diameter of the sun.
    The size of a star affects its brightness.
    Specifically, luminosity is proportional to radius squared..

  • How much more light does a 8 meter telescope gather than a 2 meter telescope?

    Because an 8-meter telescope has 4 times the diameter of a 2-meter telescope, its light-collecting area is 4^2 = 16 times as great..

  • Who are astronomers Class 6?

    A scientist who studies the objects in the sky, including planets, galaxies, black holes, and stars, is called an astronomer..

  • Who are astronomers Class 6?

    Astronomy is the study of the Universe and everything in it, including planets, stars, galaxies, comets, and black holes.
    It's full of huge distances, gigantic sizes, and long periods of time.
    It's a BIG subject.

  • Who are astronomers Class 6?

    The Milky Way Galaxy is our galaxy.
    It is 160,000 light years in diameter and about 2000 light years think.
    It contains about 100 billion stars..

  • In addition stars are very important because they make life on Earth. the most important is the Sun, because without that it wouldn't be life on Earth .
    Earth would just be a rock with ice.
    For example: Ancient sailors used the stars to help guide them while they were at sea.
  • Light travels at a speed of about 300,000 km per second or 186,000 miles per second.
    It takes about 8 minutes, 20 seconds for light from the Sun to reach the Earth.
-lived through a long mars winter -are still going strong (four times as long as expected).
each rover has become.
bigger and more complex as we have learned  ,Early astronomers knew: Sun, Moon, Stars, Mercury, Venus, Jupiter, Saturn, comets, and meteors ; Now we know the solar system has: one star, eight planets (added  ,Now we know the solar system has: one star, eight planets (added Uranus and Neptune), 135+ moons, asteroids, comets, and meteoroids.

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