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!What calculations go into predicting eclipses? (Advanced)
But seriously: what was there before the Big Bang? (Beginner)
Can two lunar eclipses occur in the same month? (Advanced)
Can we look back in time and see our galaxy forming? (Intermediate)
Can we make a movie of the Milky Way galaxy's rotation? (Beginner)
Can you tell time by the Big Dipper? (Beginner)
Could someone travel the universe in his or her own lifetime? (Beginner)
Could we be seeing dead stars? (Beginner)
Did time go slower just after the Big Bang? (Advanced)
Do we have to worry about relativity when studying galactic objects? (Intermediate)
Do we really observe the edges of galaxies at different epochs? (Advanced)
How can I calculate the position or path of the Sun for a given time and location? (Intermediate)
How can I watch the Perseid meteor shower? (Beginner)
How do I maximize my chances of seeing shooting stars? (Intermediate)
How do sunrise and sunset times change with altitude? (Intermediate)
How is the time of sunrise calculated? (Intermediate)
How long does it take for the Sun's light to reach us? (Beginner)
If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe? (Intermediate)
If Mars is only about 35-60 million miles away at close approach, why does it take 6-8 months to get there? (Intermediate)
If the Earth's rotation period is less than 24 hours, why don't our clocks fall out of sync with the Sun? (Intermediate)
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moon==================================- GENERAL QUESTIONS
- Where does the name "Moon" come from? (Beginner)
- What percent of the time can astronomers observe without interference from the Moon? (Beginner)
- How do we measure the size of the Moon and of the Sun? (Beginner)
- How long is twilight on the Moon? (Beginner)
- Does the Moon rotate? (Beginner)
- Is the Moon hollow? (Intermediate)
- Does the Moon rotate? Are there other moons that always keep one face toward their planet? (Intermediate)
- How does the Moon stay "suspended" in the air? (Intermediate)
- Can I buy land on the Moon? (Intermediate)
- Can you fire a gun on the Moon? (Intermediate)
- What happens to a bullet fired on the Moon? (Intermediate)
- Can moons have moons? (Intermediate)
- Can we prove that the Moon isn't hollow? (Intermediate)
- Is the Moon spherical? (Intermediate)
- THE MOON LANDINGS
- OBSERVING THE MOON
- Why is the Moon so bright? (Beginner)
- What is that ring (or rainbow) around the moon? (Beginner)
- Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
- Why is the shadow on the Moon the shape it is? (Beginner)
- Why are the Moon and Sun sometimes orange or red? (Beginner)
- Why is the moon in a different place every night? (Beginner)
- Will the Moon be invisible in 500 million years? (Beginner)
- How can you tell if a crescent moon is preceding or following a new-moon phase? (Beginner)
- How do I explain to my children why the Moon has phases? (Beginner)
- On which days can I see the Moon in the evening / morning and why is this so? (Beginner)
- The Moon and Sun are the same apparent size in the sky. The Moon is moving away from us at 3.8 centimeters/year. Isn't it improbable that we live in an epoch in which they appear the same size in the sky? (Beginner)
- Does the direction of the moon's crescent change through the night? (Beginner)
- Does the Moon look different in the northern and southern hemispheres? (Beginner)
- Why is the Moon higher in the sky in winter and lower in the summer? (Beginner)
- Why does the Moon look big on the horizon? (Intermediate)
- Is it possible to see the full Moon and the Sun simultaneously in high northern latitudes when the Sun doesn't set? (Intermediate)
- How can I find out if the new moon has been sighted? (Intermediate)
- Why do the size and brightness of the full moon change? (Intermediate)
- Are there any new craters on the Moon? (Intermediate)
- How does the position of Moonrise and Moonset change? (Intermediate)
- When can I see the Moon through the hole in the Pantheon? (Intermediate)
- Is the Moon always visible during winter on the North Pole? (Intermediate)
- How does libration allow us to see more than 50% of the Moon? (Advanced)
- Why is the time between two successive full moons different from the lunar synodic month? (Advanced)
- Is the Moon seen as a crescent (and not a "boat") all over the world? Is the same phase of the moon visible from the Northern and Southern hemispheres? (Advanced)
- A line drawn perpendicular to a line through the tips of the horns of the crescent moon doesn't point to the Sun! Why not? (Advanced)
- LUNAR ECLIPSES
- GEOLOGY
- THE MOON AND THE EARTH
- Are Earth and the Moon "twin planets"? (Beginner)
- How much does the Earth "wobble" on its orbit due to the Moon's gravity? (Intermediate)
- What will happen to Earth's tides as the moon moves away from us? (Intermediate)
- Why are there high tides during a Full Moon? (Intermediate)
- Did the Moon or planets form in a manner similar to that of Earth? (Beginner)
- Are there solar tides? (Beginner)
- Does lunar gardening really work? (Beginner)
- What would happen to the Earth if an asteroid hit the Moon? (Intermediate)
- What would happen if we did not have a Moon? (Intermediate)
- Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (Intermediate)
- The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (Intermediate)
- What happens to the Earth as the moon gets farther away and will it ever go away entirely? (Intermediate)
- Why does the Earth only see one side of the Moon? (Intermediate)
- Why are there both high and low tides? (Intermediate)
- Why does the Earth have only one moon? (Intermediate)
- Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
- What would happen if Earth had more than one moon? (Intermediate)
- What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
- What is Earthrise over the Moon? (Intermediate)
- Have astronomers discovered Earth's second moon? (Intermediate)
- Does Mt. Everest cast a shadow on the moon? (Intermediate)
- Does the Mediterranean sea have tides? (Intermediate)
- How close was the Moon to the Earth when it formed? (Intermediate)
- Is Earth-moon tidal friction causing global warming? (Intermediate)
- How do we know the mass of the Earth and the Moon? (Advanced)
- Can other terrestrial moons be (or have been) stable? (Advanced)
- What is the three-body problem? (Advanced)
=================== - GENERAL QUESTIONS
- Where does the name "Moon" come from? (Beginner)
- What percent of the time can astronomers observe without interference from the Moon? (Beginner)
- How do we measure the size of the Moon and of the Sun? (Beginner)
- How long is twilight on the Moon? (Beginner)
- Does the Moon rotate? (Beginner)
- Is the Moon hollow? (Intermediate)
- Does the Moon rotate? Are there other moons that always keep one face toward their planet? (Intermediate)
- How does the Moon stay "suspended" in the air? (Intermediate)
- Can I buy land on the Moon? (Intermediate)
- Can you fire a gun on the Moon? (Intermediate)
- What happens to a bullet fired on the Moon? (Intermediate)
- Can moons have moons? (Intermediate)
- Can we prove that the Moon isn't hollow? (Intermediate)
- Is the Moon spherical? (Intermediate)
- THE MOON LANDINGS
- OBSERVING THE MOON
- Why is the Moon so bright? (Beginner)
- What is that ring (or rainbow) around the moon? (Beginner)
- Are there telescopes that can see the flag and lunar rover on the Moon? (Beginner)
- Why is the shadow on the Moon the shape it is? (Beginner)
- Why are the Moon and Sun sometimes orange or red? (Beginner)
- Why is the moon in a different place every night? (Beginner)
- Will the Moon be invisible in 500 million years? (Beginner)
- How can you tell if a crescent moon is preceding or following a new-moon phase? (Beginner)
- How do I explain to my children why the Moon has phases? (Beginner)
- On which days can I see the Moon in the evening / morning and why is this so? (Beginner)
- The Moon and Sun are the same apparent size in the sky. The Moon is moving away from us at 3.8 centimeters/year. Isn't it improbable that we live in an epoch in which they appear the same size in the sky? (Beginner)
- Does the direction of the moon's crescent change through the night? (Beginner)
- Does the Moon look different in the northern and southern hemispheres? (Beginner)
- Why is the Moon higher in the sky in winter and lower in the summer? (Beginner)
- Why does the Moon look big on the horizon? (Intermediate)
- Is it possible to see the full Moon and the Sun simultaneously in high northern latitudes when the Sun doesn't set? (Intermediate)
- How can I find out if the new moon has been sighted? (Intermediate)
- Why do the size and brightness of the full moon change? (Intermediate)
- Are there any new craters on the Moon? (Intermediate)
- How does the position of Moonrise and Moonset change? (Intermediate)
- When can I see the Moon through the hole in the Pantheon? (Intermediate)
- Is the Moon always visible during winter on the North Pole? (Intermediate)
- How does libration allow us to see more than 50% of the Moon? (Advanced)
- Why is the time between two successive full moons different from the lunar synodic month? (Advanced)
- Is the Moon seen as a crescent (and not a "boat") all over the world? Is the same phase of the moon visible from the Northern and Southern hemispheres? (Advanced)
- A line drawn perpendicular to a line through the tips of the horns of the crescent moon doesn't point to the Sun! Why not? (Advanced)
- LUNAR ECLIPSES
- GEOLOGY
- THE MOON AND THE EARTH
- Are Earth and the Moon "twin planets"? (Beginner)
- How much does the Earth "wobble" on its orbit due to the Moon's gravity? (Intermediate)
- What will happen to Earth's tides as the moon moves away from us? (Intermediate)
- Why are there high tides during a Full Moon? (Intermediate)
- Did the Moon or planets form in a manner similar to that of Earth? (Beginner)
- Are there solar tides? (Beginner)
- Does lunar gardening really work? (Beginner)
- What would happen to the Earth if an asteroid hit the Moon? (Intermediate)
- What would happen if we did not have a Moon? (Intermediate)
- Is the gravitational force exerted by the Earth on the Moon equal to the centripetal force acting on the Moon? (Intermediate)
- The Moon slows the Earth's rotation, but how fast was it spinning billions of years ago? (Intermediate)
- What happens to the Earth as the moon gets farther away and will it ever go away entirely? (Intermediate)
- Why does the Earth only see one side of the Moon? (Intermediate)
- Why are there both high and low tides? (Intermediate)
- Why does the Earth have only one moon? (Intermediate)
- Is the Moon moving away from the Earth? When was this discovered? (Intermediate)
- What would happen if Earth had more than one moon? (Intermediate)
- What would happen if the Moon fell out of its orbit around Earth? (Intermediate)
- What is Earthrise over the Moon? (Intermediate)
- Have astronomers discovered Earth's second moon? (Intermediate)
- Does Mt. Everest cast a shadow on the moon? (Intermediate)
- Does the Mediterranean sea have tides? (Intermediate)
- How close was the Moon to the Earth when it formed? (Intermediate)
- Is Earth-moon tidal friction causing global warming? (Intermediate)
- How do we know the mass of the Earth and the Moon? (Advanced)
- Can other terrestrial moons be (or have been) stable? (Advanced)
- What is the three-body problem? (Advanced)
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