1
$\begingroup$

Our earth can hold our atmosphere whereas Mars cannot. So the atmosphere retention mass must be between the masses of Mars and Earth, but if mass is to be considered then can an iron ball having the same mass of the earth hold an atmosphere of its own?

Also since larger planets can hold larger atmospheres, if a planet like Jupiter was like the Earth in composition and the atmosphere contained gases in the same ratio as here on earth, will it result in the atmosphere being modified to suit the conditions of higher pressure and gravity of the planet?

What kind of atmospheric changes could be expected?

Can a very large planet result in the liquefaction of gases (I know that planet size is not the prerequisite for the presence of liquified gases but), if it does, can it be due to gravity alone?

$\endgroup$
6
  • 1
    $\begingroup$ A basic hint for the first question: think about the escape velocity of the body. Escape velocity is given by $$\sqrt{\dfrac{2GM}{R}},$$ where G is the gravitational constant, M is the mass of the body, and R is the radius of the body. $\endgroup$ Commented May 14, 2019 at 10:57
  • 1
    $\begingroup$ Regarding the second and the third question: (assuming that you are thinking about a planet as big as Jupiter which is a terrestrial planet and not a gas giant), the gravity would be so large that: 1)The atmosphere would be much larger; 2) the gases in the lower layers of the atmosphere would be under high pressure and thus would be liquefied or maybe even solidified. So yeah, the atmosphere would be "modified" and yes, this leads to liquefaction of gases. But I'm not very sure where gravity is the only factor in play here or not. $\endgroup$ Commented May 14, 2019 at 11:12
  • $\begingroup$ This depends strongly on what you consider, in terms of the amount of gas present, to constitute an "atmosphere". If you get really, really strict about it, even the Moon, technically, has an "atmosphere". $\endgroup$ Commented May 14, 2019 at 11:29
  • $\begingroup$ Possible duplicate of What is the critical mass of a planet to have an atmosphere like Earth's? $\endgroup$ Commented May 14, 2019 at 11:33
  • 1
    $\begingroup$ Google up "Gas giants". That's all you need to know $\endgroup$
    – Alastor
    Commented Aug 25, 2022 at 16:32

2 Answers 2

1
$\begingroup$

One reason Mars lost its atmosphere is that it lost its magnetic field. Without a magnetic field to protect it, the upper atmosphere is gradually blown away by the charged particles in the solar wind.

$\endgroup$
0
$\begingroup$

It must be enough to curve space-time around it significantly.But the more mass an object has doesnt mean the more atmosphere it will have.Neutron stars , which have 3 or 4 times the mass of the size have an atmosphere of 10 centimeters maximum . See :Neutron Stars - Kurzgesagt

$\endgroup$
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.