Tag Archives: planets

Einstein: Space-Time Curvature Confirmed

When you hear about “space-time,” it’s just a way to say that space is related to time. And the curvature of space-time, as Albert Einstein predicted, is the way space and time alike literally bend around a mass such as the … Continue reading

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Johannes Kepler and Planetary Motion

Thales and Pythagoras suggested that the natural world could be understood. Aristotle dared to imagine what was beyond the Earth. Plato encouraged thought about the universe, even if he did take astronomy one step forward and two steps backward. Copernicus … Continue reading

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The Copernican Revolution

Nicolaus Copernicus lived from 1473-1543, a time when rebellion against the Church was at its height. And unfortunately for the astronomy of the time, it had gotten inextricably tied up with Christian teachings. In that time, heaven and hell weren’t … Continue reading

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The Ptolemaic Universe

Claudius Ptolemy lived about five centuries after the Greek philosopher Aristotle’s time. Aristotle’s model for the universe—the first geocentric model, with Earth at the center—was still widely accepted, and Ptolemy sought to improve it. Ptolemy was one of the first of … Continue reading

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Pseudoscience

You may have heard of a common pseudoscience—astrology. Astrology is a pseudoscience because it’s a set of beliefs that seem to be based on scientific ideas, but really, it fails to obey even the most basic rules of science. What … Continue reading

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The Ecliptic

The ecliptic, as astronomers call it, is the apparent path of the sun against the background of the stars in the sky. It’s useful because it tells us how to find the planets in the sky. They can be hard to … Continue reading

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Where Are We?

In the 4th century B. C. E. (Before Common Era), scientists believed the Earth was the center of the universe. Before that, they were convinced the Earth was flat. Now, if anyone so much as mentions that the Earth is … Continue reading

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