As far as we know, no asteroids even close to the size of the moon exist nearby, so it is highly unlikely that any of this would ever happen. Critical thinking challenge: Why is the question posed by the headline more sci-fi than hard science? The question posed by the headline more sci-fi than hard science.
But honestly, all this talk is more sci-fi than hard science. The question posed by the headline is more sci-fi than hard science.
The text states that no asteroids even close to the size of the moon exist nearby, so it is highly unlikely that any of this would ever happen. The text also states but honestly, all this talk is more sci-fi than hard science. The evidence from the text proves that a meteorite that big wouldn't hit the moon.
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Eclipses would be no more. Whether you're talking solar eclipses -- partial, total or annular -- or lunar eclipses, where Earth's natural satellite passes into our shadow, we would no longer have eclipses of any type. Eclipses require three objects to be aligned: the Sun, a planet and a planet's moon. When the moon passes between the Sun and a planet, a shadow can be cast on the planet's surface total eclipse , the moon can transit across the Sun's surface annular eclipse , or it can obscure just a fraction of the Sun's light partial eclipse.
But without a moon at all, none of these could occur. Our only natural satellite would never pass into Earth's shadow if it didn't exist, putting an end to eclipses. The Moon exerts a tidal force on the Earth, which not only causes our tides, but causes braking of Image credit: Wikimedia Commons user Wikiklaas and E.
The length of a day would remain constant. You might not think about it much, but the Moon exerts a tiny frictional force on the spinning Earth, causing our rotation rate to slow down over time. We might only lose a second here or there over many centuries, but it adds up over time.
Our 24 hour day was only 22 hours back when dinosaurs roamed the Earth, and was under 10 hours a few billion years ago. In another four million years, we won't need leap days any longer in our calendar, as the rotation rate slows and the length of a day continues to get longer.
But without a Moon, all that would cease. It would be 24 hour days every single day to come, until the Sun itself ran out of fuel and died. Gorey Harbour at low tide, illustrating the extreme difference between high and low tide found in Image credit: Wikimedia Commons user FoxyOrange.
Our tides would be tiny. High tide and low tide presents an interesting, vast difference for those of us who live near the coast, particularly if we're in a bay, sound, inlet, or other area where water pools. Our tides on Earth are primarily due to the Moon, with the Sun contributing only a small fraction of the tides we see today. The small white flash on the right-hand side is the impact occurring, but at a speed seven times slower than reality.
At regular speed, the flash lasted four-tenths of a second. The rock that collided with the moon was only about 10 inches across. If such a rock were to head toward Earth, it would burn up in the Earth's atmosphere and never reach the ground.
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