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Galaxies
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The Moon
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Comets
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Observing Basics
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Space Exploration
What’s Launching This Week
Human Spaceflight
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Human Spaceflight
With renewed interest in going to the Moon, how will future trash be dealt with?
Stars
How long do planetary nebulae last?
The Moon
What happens to the Moon during New Moon?
Exotic Objects
How do black holes generate magnetic fields?
Deep-Sky Objects
Why doesn’t Astronomy magazine recognize Messier 110?
Solar System
Why are craters perfectly round even though meteorites are irregularly shaped?
Solar System
How often does Earth transit the Sun for an observer on Mars?
Cosmology
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Galaxies
How can galaxies merge if the everything in the universe is moving apart?
Solar System
Why does the Moon turn red during a lunar eclipse?
Solar System
Can Mars’ moons cause solar eclipses?
Solar System
Could you see Mars’ moons from the surface with just your eyes?
Space Exploration
Why does the travel time from Earth to Mars vary?
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