- What should I know about the upcoming Solar Eclipse (2017)? (Beginner)
- Do galaxies that are receding from us faster than the speed of light disappear from our observations? (Intermediate)
- Why are astronomers interested in gravitational waves? (Intermediate)
- Can two galaxies move away from each other faster than the speed of light? (Intermediate)
- What is a graviton? (Intermediate)
- Why are there high tides during a Full Moon? (Intermediate)
- Why is Neptune still considered a planet when Pluto crosses its orbit? (Intermediate)
- Could there be objects orbiting interior to Mercury? (Intermediate)
- Have the inner planets cleared their neighborhood? (Intermediate)
- What caused the Big Bang and created the Universe? (Beginner)
- If spacetime is curved, is it possible for us to look into space and see light from Earth from long ago? (Intermediate)
- What effect did compression waves have immediately following the Big Bang? (Intermediate)
- If gravity isn't a force, how does it accelerate objects? (Advanced)
- Can we look back in time and see our galaxy forming? (Intermediate)
- How do I maximize my chances of seeing shooting stars? (Intermediate)
- Are exoplanets real? (Intermediate)
- Can the Sun be closer to the Earth than any planet is to Earth? (Intermediate)
- Cosmologists say the expansion of the universe is accelerating, what is driving this? (Intermediate)
- If photons have zero mass, why do they feel the effects of gravity? (Advanced)
- What time is sunrise/sunset or moonrise/moonset at my location? (Beginner)
- What causes the aurora? (Beginner)
- What do all the angles in a table for a planet's orbit mean? (Advanced)
- How likely is it for a planet to transit its star? (Intermediate)
- Why is the Moon higher in the sky in winter and lower in the summer? (Beginner)
- Is the Moon always visible during winter on the North Pole? (Intermediate)
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