Questions tagged [comets]
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42 questions
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Could cometary non-gravitational acceleration be linked to surface cohesion transitions?
In several comets, including the interstellar comet 3I/ATLAS, a non-gravitational acceleration is observed, i.e., a net thrust not fully accounted for by gravity. While outgassing is known to produce ...
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Could dark matter be responsible for periodic comet impacts on Earth?
I've been reading a fascinating paper by Lisa Randall and Matthew Reece on the potential role of dark matter in triggering periodic comet impacts on Earth, possibly linked to mass extinctions. The ...
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Kepler's laws of planetary motion
I was going through some questions and I found that although asteroids obey Kepler's law of planetary motion but comets don't. I searched on the internet and it's given that comets do obey the laws ...
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Earth doesn't have seafloor craters. Does it mean water has been on Earth since long time before in the past?
Is it true that Earth didn't get its water by cometes impacts as there are no subocean craters so it seems water acted as a comete bumper long before in the past?
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Where would the energy go if a nuke intercepted a meteor?
I thought of this question from watching the trailer for the new movie "Greenland" with Gerard Butler. Essentially in the trailer a huge comet falls towards the earth, apocalypse, etc.
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Is the parallax of NEOWISE primarily caused by the earth's or the comet's motion?
The Comet C/2020 F3 (also known as "NEOWISE") appears to move compared to stars in the background:
(Screenshots from Stellarium)
Those images are one hour apart as seen from Germany.
Is this ...
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Query about the ion tail of a comet
I understand that the solid gas coating the nucleus of a comet is melted and that this gas is ionised by the UV rays from the sun. This makes the gas particles charged.
What I dont understand is why ...
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Observing a comet and predicting its trajectory
I'm planning to observe a comet of apparent magnitude around $18.5$ using an observatory telescope. I plan to figure out the trajectory of the comet $-$ all its orbital elements. Given that I only ...
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Do comets and meteors attract artificial satellites while passing by?
What will be effect on artificial satellites when comets or meteors come close or pass by?
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Why are we using large chunks of copper to smash asteroids and comets? [closed]
Why is copper used? Isn't that expensive?
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Speed at the perihelion [closed]
Hale Bopp has a period of 2400 days, with a mean distance from the sun at 174 AU and 1AU away in perihelion and 357 AU away in aphelion, what is its speed at the perihelion?
what formulas do you need ...
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Forces On Comets
This is the orbit of a comet
The question is -
Draw an arrow at point D to show the direction of the force acting on the comet.
At point D, the comet is moving away from the Sun, so i think that the ...
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Comets and early Solar System
Comets are often said to contain primordial material of Solar System: it would be the material of the original protoplanetary disk that originated planets and all the other objects.
Documents that ...
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How do you find the actual acceleration of a comet approaching the Sun at near $c$? [closed]
Suppose a body is travelling at the speed of light minus 2.998 $m/s$ when it gets near the Sun where nominal $g = 270 m/s^2$, what is the actual increase of the speed in a second?
What is the formula ...
user137879
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Why do the Perseids only happen once per year, not twice or four times?
The Perseid meteor shower is caused by debris left behind Comet Swift-Tutte. My understanding is that the meteor shower occurs once per year because that's when the Earth passes near the orbital path ...
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