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Could two planetesimals orbit a dense object and share an atmosphere?
Could two objects be caught into an orbit around some kind of dense object, perhaps a rogue planet. Could they share an atmosphere.
View ArticleWhat will be the temperature on Earth when Sun finishes its main sequence?
We know that presently Sun is 4.5 billion years into its main sequence. It has another 5 billion years before it enters the Red Giant phase. We also know that Sun's luminosity increases by 10% every...
View ArticleWhat would the effects on or around Earth if Betelgeuse went supernova?
There's been a lot of news lately about Betelgeuse possibly exploding sooner than perhaps was expected. Some examples:Guinan, Edward F.; Wasatonic, Richard J.; Calderwood, Thomas J. (8 December 2019)....
View ArticleIs there or will there be any search after a primordial black hole 500 au...
Since 2019 it is proposed that the hypothetical Planet IX may in fact be a primordial black hole. Black holes are being looked after differently than planets. You can look for a gravitational lens or...
View ArticleHow likely does a body more massive than Eris exist beyond the Kuiper belt?
Other than the hypothetical Planet IX, is it likely if there's a (dwarf) planet more massive than Eris orbiting between Eris and Planet IX? Michael Brown seems to have found it likely. As far as we...
View ArticleBased on discoveries of new TNOs since 2016, is planet Nine still necessary...
It is almost five years since the announcement of the likelyhood of another planet that is responsible for clustering eTNO's orbits, very close perihelia of detached dwarf planets to the Sun, and high...
View ArticleOrbital decay via gravitational emission in a hypothetical, two-body universe
Assume we have a universe with nothing in it except for two objects. One of them is a stationary object that is perfectly spherical with the mass of the Moon (without any atmosphere, of course; also,...
View ArticleCould Planet Nine be much smaller than thought previously?
In 2016, Caltech astronomers began testing a Planet Nine hypothesis to explain the eccentric and inclined orbits of distant dwarf planets such as Sedna, 2015 TG387, Niku, and 2012 VP113. The hypothesis...
View ArticleWhat do falsifiability and verifiability actually mean as a precondition of a...
What do falsifiability and verifiability actually mean as a precondition of a scientific hypothesis?I have been hearing from science guys that unlike philosophical hypothesis or theory, to be a...
View ArticleAre there gas clouds in space so dense that we couldn't see out of them if...
The images of telescopes capturing gas clouds are quite intriguing to me, which keeps me wondering about visibility inside them.Are there gas clouds in space so dense that we couldn't see out of them...
View ArticleWhat about the U planet?
In 2014 and 15, an object called U has been detected by the ALMA in Chile, considered likely to be a super-Earth at 300 AU, among other options. Is it located where the hypothetical super-Earth...
View ArticleWhat if Earth gained 1 km/s orbital velocity?
How would Earth's orbit be affected if we (hypothetically) added $1 {\rm km/s}$ to its orbital velocity? Would Earth reach close to Mars' orbit?Could Earth get gravitational assist from Mars and go to...
View ArticleIs there a star over my head?
Say I'm standing up straight, and I draw a straight line from my core through the top of my head (perpendicular to the ground). What is the probability that that line intersects with a star?EDIT: I'm...
View ArticleCould Planet X have a perihelion much closer than 300 AU and still be...
In August, Michael Brown and Konstantin Batigyn proposed new data concerning the hypothetical Planet X to explain the orbits of the 19 TNOs. They suggest a perihelion of 300 AU, but might Planet X be...
View ArticleWhen might Rowan-Robinson's planet be discovered or disproved?
A month ago Michael Rowan-Robinson discovered three dots on old images of the sky which may or may not be an undiscovered planet (that's not identical to Brown's and Batigyn's hypothetical planet). I...
View ArticleEarth’s rotation speed vs rate of lunar cycle
Hypothetical QuestionIf the earth’s rotation slowed down to align to the lunar cycle so that the orbital period began and ended at the same lunar phase, what other things would result?For example, take...
View ArticleHow much energy to shorten a synodic month by about 1.56%?
Suppose the moon underwent a single, massive, large-object bombardment event. About what number (or range) of about what mean mass of objects could shorten the synodic month by about 1.5633%?(Assume...
View ArticleHow might a lower gravity planet sustain a warm, earth-like atmosphere?
I'm designing a hypothetical lower-gravity planet with 0.47M, 0.79r and 0.76g, with a similar density to Earth. I've already determined that this mass, radius, and density will allow my planet to...
View ArticleIf you were standing on a habitable moon of a gas giant, what would the...
If you were standing on the proplanetary side of a habitable moon of a gas giant, and the moon had a thick enough atmosphere to make the sky blue, how would the gas giant look during the day? Would it...
View ArticleWhat if the sun was replaced by Alpha Centauri? [closed]
What would happen if the sun suddenly got replaced with the entire Alpha Centauri system? Alpha Cen A will be in the sun’s position, with Alpha Cen B not too far off into the distance. How would this...
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