How big would a planetary body have to be so that you could not jump off it?

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SaltyNuts

Platinum Member
May 1, 2001
2,398
277
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I have this weird recurring dream where I wake up in a space suit on some planetary body I have no idea what it is. But its like a big asteroid. And I'm terrified to move hardly at all because I'm worried its gravity might be so weak that I would fly off it.

So, basically, how big would a planetary body have to be so that a reasonable sized adult (say 260 lbs) could not escape its gravitational pull even if he jumped as hard as he can? Not looking for an exact number, just more/less, of course. I want to know so maybe next time I have that dream I will feel more comfortable to move around and jump and dance and have fun if the rock seems big enough LOL.
 
IronWing

IronWing

No Lifer
Jul 20, 2001
73,101
34,399
136
It depends on how fast you want to come back down. Anyway, 60 ksmoot in diameter should be plenty, assuming earthlike planetary density and that you're not too weeny.
 
A

Ajay

Lifer
Jan 8, 2001
16,094
8,114
136
SaltyNuts said:
I have this weird recurring dream where I wake up in a space suit on some planetary body I have no idea what it is. But its like a big asteroid. And I'm terrified to move hardly at all because I'm worried its gravity might be so weak that I would fly off it.

So, basically, how big would a planetary body have to be so that a reasonable sized adult (say 260 lbs) could not escape its gravitational pull even if he jumped as hard as he can? Not looking for an exact number, just more/less, of course. I want to know so maybe next time I have that dream I will feel more comfortable to move around and jump and dance and have fun if the rock seems big enough LOL.
Click to expand...
260 lbs isn't a reasonable weight for an adult male unless said adult is over 7 feet tall. Sadly, I'm closer to the former than I am to the latter.
 
S

SaltyNuts

Platinum Member
May 1, 2001
2,398
277
126
Ajay said:
260 lbs isn't a reasonable weight for an adult male unless said adult is over 7 feet tall. Sadly, I'm closer to the former than I am to the latter.
Click to expand...


6'2" (closer to 6'3"), and chalk full of muscles, 260 is right there.
 
IronWing

IronWing

No Lifer
Jul 20, 2001
73,101
34,399
136
Real answer:
Modify the inputs to achieve an escape velocity of ~1.5 m/sec.

www.omnicalculator.com

Escape Velocity Calculator

Use our escape velocity calculator to find out the speed required to leave the surface of any planet.
www.omnicalculator.com www.omnicalculator.com

BTW, 60 ksmoot is in the ballpark.
 
Red Squirrel

Red Squirrel

No Lifer
May 24, 2003
70,726
13,851
126
www.anyf.ca
Ajay said:
260 lbs isn't a reasonable weight for an adult male unless said adult is over 7 feet tall. Sadly, I'm closer to the former than I am to the latter.
Click to expand...

That's almost twice my weight, and I feel I can lose a few pounds. I can't imagine being that weight, it would literally be uncomfortable. I say that while I'm eating a double chocolate cookie after having had a baconator for supper. This is why I'm fat.
 
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Torn Mind

Torn Mind

Lifer
Nov 25, 2012
12,078
2,772
136
Red Squirrel said:
That's almost twice my weight, and I feel I can lose a few pounds. I can't imagine being that weight, it would literally be uncomfortable. I say that while I'm eating a double chocolate cookie after having had a baconator for supper. This is why I'm fat.
Click to expand...
Until you experience the power such a frame gives. People will back off and you can steal lunch money by thugging it up.

www.stanleycupofchowder.com

Zdeno Chara is underappreciated

Big Z is still good at hockey.
www.stanleycupofchowder.com www.stanleycupofchowder.com

1636756431732.png
 
pete6032

pete6032

Diamond Member
Dec 3, 2010
8,175
3,607
136
Red Squirrel said:
That's almost twice my weight, and I feel I can lose a few pounds. I can't imagine being that weight, it would literally be uncomfortable. I say that while I'm eating a double chocolate cookie after having had a baconator for supper. This is why I'm fat.
Click to expand...
130 lbs. How tall are you? In freedom units.
 
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Torn Mind

Torn Mind

Lifer
Nov 25, 2012
12,078
2,772
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130 lb male and thinking he's fat.

I'm 55.9 kg(was 54.1 about a month ago) and 6ft tall and I know I'm weak and thin(but in fine mental and metabolic shape). good 10lbs of muscle I should aim to gain.
 
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