One hundred years ago, one star changed our view of the universe, proving that the Andromeda “nebula” was a galaxy like our Milky Way.
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Controlled experiments are impossible in astronomy, as are direct measurements of physical properties of objects outside our solar system. So how do astronomers know so much about them?
If you ever felt nauseous, fatigued or disoriented after using your phone or computer, you may be experiencing a condition similar to motion sickness.
Let’s talk numbers for a moment. The moon is approximately 384,000 kilometres away, and the sun is approximately 150 million kilometres away. The mean distance between Earth and the sun is known as the…
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Laureate Professor of Mathematics, University of Newcastle
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PhD; Lawrence Berkeley Laboratory (retired) and Research Fellow, University of California, Davis
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Professor of Astronomy, Mathematics, and Physics, Athabasca University
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Professor of Physics and Astronomy, Ithaca College
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Senior UX Researcher, Iowa State University