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May
13
comment What would happen if Jupiter and Earth were at the same distance as the Moon is from Earth?
Some, but not all, of the bad effects could be alleviated by changing the conditions a bit: Move Jupiter into Earth's current orbit around the Sun, and put Earth into a circular orbit around Jupiter in tidally locked rotation. Once Earth's shape settles down from the new tidal forces, conditions shouldn't be too bad. Interactions with Jupiter's other moons might be a problem -- so move them. Interactions with Jupiter's magnetic field and radiation belts would still be, ahem, interesting. We should get some truly spectacular auroras, and we could see how Jupiter reacts to the extra heat.
May
13
comment What would happen if Jupiter and Earth were at the same distance as the Moon is from Earth?
What do you mean by "H3"?
May
8
comment What would this moving point of light be?
A meteor would appear as a streak of light moving very quickly. Satellites, including the ISS, generally appear as slowly moving point sources of light. Assuming you saw a point source, your description, particularly the 2-minute duration, is consistent with a satellite -- but probably not with a glint from a solar panel. Someone can probably determine what would have been visible at your location at that time; the ISS trackers I've found so far don't show past events.
May
6
comment Is there a way to tell what the surface of a planet is like?
The way you described it, I thought you meant that there's an equation that will tell you whether a particular planet has life or not. The Drake equation doesn't do that. All it does is provide an estimate (given a number of assumptions you have to plug into it) of how many communicative extraterrestrial civilizations currently exist in this galaxy. en.wikipedia.org/wiki/Drake_equation
May
5
comment Why doesn't the New Horizons probe fly any nearer than 10,000 km from Pluto?
Speculation: In a closer approach it might not be able to focus on the surface well enough to get a clear image; that far from the Sun it probably needs long exposures. And the trajectory has to allow for its next target after it leaves the Pluto system.
May
5
comment Is there a way to tell what the surface of a planet is like?
"I think there is an equation to find if there is life on another planet ..." -- An equation? That seems implausible.
May
1
comment Would dark energy save the earth for a while as the sun heats up?
Both matter and antimatter have positive mass, for what that's worth (I believe it's been experimentally verified). There might be such a thing as negative matter, that might have characteristics similar to what you describe, but I think it would be very different from antimatter, and I'm reasonably sure it hasn't been detected. Someone who knows physics better than I do might want to comment further.
Apr
30
comment Would dark energy save the earth for a while as the sun heats up?
What is the basis for your idea that "antimatter is the cause of dark energy"? As for the Earth's distance from the Sun in the distant past, that's probably already been studied. I'd expect Earth to move into a slightly larger orbit as the Sun loses mass. It's also believed that the planets' orbits have changed substantially, especially in the very early history of the Solar System, and especially Jupiter.
Apr
21
revised Circular formation around the moon
added 116 characters in body
Apr
21
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Apr
21
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Apr
21
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Apr
20
revised Circular formation around the moon
Replace image with a cropped version
Apr
20
suggested approved edit on Circular formation around the moon
Apr
20
comment Could there be a closer star to Earth than the Alpha Centauri triple star system, excluding the Sun?
Sorry, I was assuming that a "brown dwarf" is a kind of star. I just checked Wikipedia, and it says that brown dwarfs are "substellar objects". Still, finding a brown dwarf closer than Alpha Centauri would be quite interesting.
Apr
20
answered Circular formation around the moon
Apr
20
comment Could there be a closer star to Earth than the Alpha Centauri triple star system, excluding the Sun?
The hypothetical Nemesis would be a brown dwarf in orbit around the Sun. A nearby brown dwarf that's not in orbit around the Sun would meet the question's criteria, and would not necessarily be "many magnitudes brighter" than Nemesis.
Apr
6
comment Collision of asteroid and gaseous planet - what would happen
@LocalFluff: Which is why I referred specifically to rocky or iron asteroids. SL9 was obviously less strongly held together by its own internal structure. And the question mentioned asteroids, not comets.
Apr
6
comment Collision of asteroid and gaseous planet - what would happen
@LocalFluff: I think a reasonably dense object like a rocky or iron asteroid would have more than enough internal strength to hold itself together for a while even inside the Roche limit. Very large objects like planets behave like fluids (for example, Earth is round because it's close to hydrostatic equilibrium), but smaller objects behave like solids. A body small enough to be non-spherical isn't big enough for tides to be a huge influence.
Apr
4
comment Can we observe what objects exist at the L3 positiion of planets of our solar system?
L3, unlike L4 and L5, is not particularly stable; I wouldn't expect to find much there.