Astronomy question relating to mass of a person in a different planet.. I’m really...

R

Randy P

New member
You didn't cut and paste the numbers.

Weight = GMm/r^2. So the weight compared to earth will be proportional to the mass and inversely proportional to the square of the radius.

For instance, if the planet were 2 x the mass of earth and 3 x the radius, the weight would be 2/3^2 = 2/9 of the weight on earth.

If the planet were 1.5 x the mass of earth and 0.5 x the radius, the weight would be 1.5/0.5^2 = 6 times the weight on earth.
 
...confused about this one...? Given that the planet orbiting the nearby star 51 Pegasi is about larger than the Earth, but more massive, on that world you would weigh:
half as much as you do here.
the same as you do here.
twice as much as you do here.
more than you do here.
more that you do here.
 
Mass of Pegasi 51b = 8.97^26 kg
Radius of Pegasi 51b = 100,000 km

Surface gravity = G * m ÷ r^2

'G' is gravitational constant (..6.673^minus 11...)
'm' is mass of planet
'r' is radius of planet
 
The larger the planet, the higher the gravity the more you will weigh, the smaller the planet the less gravity it will have so you will weigh less.

Like if you went to the moon which is one sixths the size if the earth you can subtract one sixth of your weight.

Then lets say you are born on a planet a hundred times larger than the earth, and when you turned lets say twenty years old, you came here to earth, you would be a super man, wouldn't that be great.
 
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