Tag Archives: gravity

Tides

Humans have long known of the link between the Moon and the tides. We’re learning that it’s not only the ocean that’s affected. To picture the effect of the Moon’s gravity on the planet Earth, draw two lines starting at … Continue reading

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Dark Flow

The known universe is about 27.4 billion light years across. It’s thought that the universe is bigger than that, possibly a lot bigger, but we can’t see farther than 13.7 billion light years in any direction. Our knowable universe is … Continue reading

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Cosmological Constant

Albert Einstein didn’t like it. When he worked out his General Theory of Relativity in 1916 he realized that it made for an unstable universe. The General Theory is all about gravity and it has been one of the most … Continue reading

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