Astronomy practice exam quizlet

  • Do astronomers often use parallax to measure distances to stars?

    Astronomers use an effect called parallax to measure distances to nearby stars.
    Parallax is the apparent displacement of an object because of a change in the observer's point of view..

  • How is the distance of the moon most accurately measured?

    This distance is routinely measured using LIDAR (LIght Detection And Ranging) stations which bounce laser pulses off of the retroreflecting mirrors placed on the Moon by the Apollo astronauts..

  • What is the most accurate way to determine the distance of a nearby galaxy?

    One possibility, for example, is to measure the brightness of red giant stars when they reach the brightest phase during their stellar evolution.
    This happens at a well-defined brightness that is known as the Tip of the Red Giant Branch.
    This technique gives very precise distances when galaxies are relatively close..

  • What knowledge did astronomy offer to early man?

    Monitoring the motions of stars and planets in the sky was the best tool to track time, which was fundamental for agriculture, religious rituals and navigation.
    The first documented records of systematic astronomical observations date back to the Assyro-Babylonians around 1000 BCE..

  • What practical value did astronomy offer?

    Question: What practical value did astronomy offer to ancient civilizations? Answer: It helped them keep track of time and seasons, and it was used by some cultures for navigation.
    Only a few ancient cultures were good a predicting eclipses, and eclipses play little practical role in civilization..

  • The 8-meter telescope has 16 times the light-collecting area of the 2-meter telescope.
    Which of the following best describes why radio telescopes are generally much larger in size than telescopes designed to collect visible light?
  • 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.
  • The reason astronomers keep building bigger and bigger telescopes is that celestial objects—such as planets, stars, and galaxies—send much more light to Earth than any human eye (with its tiny opening) can catch, and bigger telescopes can detect fainter objects.
Study with Quizlet and memorize flashcards containing terms like cepheids have been most useful for what advances in astronomy?, The Jupiter Great Eye Storm 

What is an example of astronomy?

For example, astronomy is the scientific study of the stars, the planets and other objects in space. It was a shooting star that propelled me into astronomy in the first place.

What is astronomy and why is it important?

Astronomy Astronomy is one of the oldest sciences in the world. The study of astronomy involves all of the objects outside Earth’s atmosphere. These include the sun, Moon, planets, stars, galaxies, and all other matter in the universe. People known as astronomers have studied these objects for thousands of years.


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