All Questions
90
questions
2
votes
2
answers
651
views
Spot of my light on the moon
This is a funny question, but worth answering. The distance between the moon and the Earth is 384,400 km. The speed of light is 299792.458 km/s. It will take 1.3 seconds (Approx.) for my laser beam to ...
- 1,387
0
votes
1
answer
92
views
What role has our Moon played in creating a persistent geomagnetic field?
The question comes from a comment by Mark Rovetta on my earlier question about the Earth's core going cold.
- 165
1
vote
3
answers
9k
views
Speed of the Moon
Why the motion of the Moon looks very slow in the sky? Doesn't it need the high speed in order to escape the earth's gravity?
- 4,194
4
votes
2
answers
3k
views
How does Earth carry Moon with it, if it can not force Moon to touch it by gravitational force?
Earth's gravitational force is acting on its Moon in such a way that it forces the Moon to rotate round its orbit by centripetal force and carries it while rotating round the Sun by gravitational ...
- 143
5
votes
1
answer
2k
views
If the Moon had gravity as strong as the Earth's, and a magnetic field, could it have supported life?
If the Moon had gravity as strong as Earth's, and a magnetic field, could it have supported life? Because if the Moon had as much gravity as Earth, it could have retained more water than is present ...
- 163
3
votes
1
answer
982
views
The Moon is slowly moving away from the earth. Does this mean that a total solar eclipse wasn't possible at some point in earth's history?
When the moon was closer to earth, was it still possible to witness a total solar eclipse millions of years ago? Or was the view-able space so small that it was impractical to even witness it?
- 131
1
vote
2
answers
269
views
Moon and the moving train
While travelling by train (travelling West to East), it seems the moon is moving in opposite direction when seen from the window, but then it reverses its direction, after a certain amount of time and ...
16
votes
1
answer
447
views
Impact location that created the moon
I was reading an article today about the 1000th orbit of the Lunar Reconnaissance Orbiter, and as many of you know NASA created an animation that simulates the history of the moon. It is speculated ...
- 661
9
votes
5
answers
1k
views
sun-moon-earth anomaly [duplicate]
When one looks at the sun and the moon in the sky together, why is it that the illuminated crescent of the moon does NOT "point" at the sun?
(More correctly the perpendicular bisector of the straight ...
Roger Firth
3
votes
3
answers
518
views
On what planar regions are the Earth, Moon.. for that matter, all astronomical bodies, placed in the Universe?
When we are on Earth, we look UP in the Sky to see the Moon. How do we have to look at Earth from Moon.. Is it the way ? If so, how are these bodies actually placed in the space?
Are all astronomical ...
msumaithri
11
votes
1
answer
181
views
Why did the june 2011 lunar eclipse last so long?
It was kind of hard to miss the lunar eclipse this week, although I didn't see it in person (Sod's law means that on every relatively major astronomical event clouds cover where I am). From what I ...
- 6,927
43
votes
5
answers
31k
views
Why is a new moon not the same as a solar eclipse?
Forgive the elementary nature of this question:
Because a new moon occurs when the moon is positioned between the earth and sun, doesn't this also mean that somewhere on the Earth, a solar eclipse (...
- 1,335
11
votes
2
answers
2k
views
Could the earth have another moon?
First, to clarify: I'm not asking if perhaps there's a moon that we haven't found yet. The question is, theoretically, would the earth be able to have another stable moon in addition to the current ...
- 3,439
20
votes
5
answers
3k
views
Does the Moon's core still contain significant heat?
On earth, using earth-sheltering techniques can significantly reduce the temperature fluctuations on a structure. Would the same statement be true as well on the Moon? Does the Moon's core still ...
Walter
89
votes
9
answers
220k
views
Why doesn't the Moon fall onto the Earth?
Why doesn't the Moon fall onto the Earth? For that matter, why doesn't anything rotating a larger body ever fall onto the larger body?
- 1,033