Podcast
Questions and Answers
What is the definition of 1 parsec in terms of parallax angle?
What is the definition of 1 parsec in terms of parallax angle?
- The distance to a star that has a parallax angle of 0.1 arc-seconds
- The distance to a star that has a parallax angle of one arc-second (correct)
- The distance to a star that has a parallax angle of 10 arc-seconds
- The distance to a star that has a parallax angle of 0.01 arc-seconds
What is the approximate diameter of the observable universe?
What is the approximate diameter of the observable universe?
- 9 × 10^10 ly (correct)
- 9 × 10^12 ly
- 9 × 10^11 ly
- 9 × 10^9 ly
How many stars are there approximately in a big galaxy?
How many stars are there approximately in a big galaxy?
- 10^12 (correct)
- 10^10
- 10^11
- 10^13
What is the conversion factor from AU to ly?
What is the conversion factor from AU to ly?
What is the unit of distance used to measure distances to the most distant galaxies?
What is the unit of distance used to measure distances to the most distant galaxies?
Why is the speed of light a limiting factor in observing the universe?
Why is the speed of light a limiting factor in observing the universe?
What happens to radiation as it passes through the Earth's atmosphere?
What happens to radiation as it passes through the Earth's atmosphere?
Why do we see blue skies and red sunsets?
Why do we see blue skies and red sunsets?
Why do astronomers prefer to site optical telescopes on the tops of mountains?
Why do astronomers prefer to site optical telescopes on the tops of mountains?
What is the approximate height of the Earth's atmosphere?
What is the approximate height of the Earth's atmosphere?
What has been the advantage of using telescopes on orbiting satellites?
What has been the advantage of using telescopes on orbiting satellites?
What is the name of the famous telescope that was launched in 1990?
What is the name of the famous telescope that was launched in 1990?
What is the main focus of the search for extraterrestrial intelligence?
What is the main focus of the search for extraterrestrial intelligence?
How many planetary systems had been identified by the start of 2014?
How many planetary systems had been identified by the start of 2014?
What is the purpose of identifying patterns of stars in the night sky?
What is the purpose of identifying patterns of stars in the night sky?
What is unique about Kepler 186f?
What is unique about Kepler 186f?
What do the stars within a constellation have in common?
What do the stars within a constellation have in common?
What is the primary reason why objects in our solar system are visible?
What is the primary reason why objects in our solar system are visible?
What is a planetary system?
What is a planetary system?
What is the approximate age of the Sun and the Earth?
What is the approximate age of the Sun and the Earth?
What is the main difference between a planet and a star?
What is the main difference between a planet and a star?
What is the term for objects orbiting around planets?
What is the term for objects orbiting around planets?
What is the additional criterion used to distinguish planets from smaller orbiting masses?
What is the additional criterion used to distinguish planets from smaller orbiting masses?
What is the process believed to have formed planetary systems?
What is the process believed to have formed planetary systems?
What is the wavelength of the light emitted?
What is the wavelength of the light emitted?
What is a paradigm in scientific terms?
What is a paradigm in scientific terms?
Who popularized the phrase 'paradigm shift'?
Who popularized the phrase 'paradigm shift'?
What is an example of a paradigm in this chapter?
What is an example of a paradigm in this chapter?
When was the phrase 'paradigm shift' first popularized?
When was the phrase 'paradigm shift' first popularized?
What is the phrase 'paradigm shift' used to describe?
What is the phrase 'paradigm shift' used to describe?
