Prometheus Fan Reviews

[delsaber8]

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

[Anonymous User]

1200km diameter as stated by Lambert in the Alien DC.

"Tiny."

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

Actually it makes less sense, 1200km is half the size of the Moon or eighth of the Earth. Gravity would be much smaller than that of Moon, they would have difficulty in walking/running around. I'd rather not to know the exact size and imagine it's Earth size.

[SM]

Shame we do know it then I guess.

[bov930527]

1200km diameter as stated by Lambert in the Alien DC.

"Tiny."

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

Actually it makes less sense, 1200km is half the size of the Moon or eighth of the Earth. Gravity would be much smaller than that of Moon, they would have difficulty in walking/running around. I'd rather not to know the exact size and imagine it's Earth size.

But don't they say in the first movie that it has 0,86 gravitational force than that of Earth? Shouldn't be much problem to walk on it in that case. Maybe it's core consists of really heavy metals and that makes up for the gravity?

[SM]

But don't they say in the first movie that it has 0,86 gravitational force than that of Earth?

Yes.

[DaddyYautja]

Quite interesting, I would have never thought they would use real planets, I would have thought it was all made up.

The planets are made up, but not the star systems.  No exoplanets the size of LV-426 have been discovered thus far.  It's too small.

What's the size of Pluto?

[Blacklabel]

..there's this thing called google...

[SM]

...and relevance.

Pluto isn't an exoplanet.

[Johnny Handsome]

Watched it yesterday, i enjoyed it.

I only thought the whole back and forth between the ship and the pyramid was a little tedious, but other than that it was good mainstream popcorn fun, even when i don't agree with many people on the design choices of the engineers.

[Winkie Bear]

1200km diameter as stated by Lambert in the Alien DC.

"Tiny."

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

Actually it makes less sense, 1200km is half the size of the Moon or eighth of the Earth. Gravity would be much smaller than that of Moon, they would have difficulty in walking/running around. I'd rather not to know the exact size and imagine it's Earth size.

But don't they say in the first movie that it has 0,86 gravitational force than that of Earth? Shouldn't be much problem to walk on it in that case. Maybe it's core consists of really heavy metals and that makes up for the gravity?

Just for fun...

If g = 0.86 x Earth gravity, then g = 8.41 m s^-2

Hence, the mass must be r^2 (g/G), where r = 600 km and G = 6.647x10^-11

yielding m = 4.537x10^22 kg

If the diameter = 1200 km, then the volume is 9.05x10^17 m^3

Ergo, the bulk density is 50,100 kg m^-3

This is a bit less than twice the density of the densest known metal, osmium.

Soooo, there you go.  I'll get my coat...

...and relevance.

Pluto isn't an exoplanet.

Factoids...

Smallest known exoplanet to date has 0.002 times the mass of Jupiter (http://exoplanet.eu/catalog/)

Pluto is 0.0000069 times the mass of Jupiter

[bov930527]

1200km diameter as stated by Lambert in the Alien DC.

"Tiny."

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

Actually it makes less sense, 1200km is half the size of the Moon or eighth of the Earth. Gravity would be much smaller than that of Moon, they would have difficulty in walking/running around. I'd rather not to know the exact size and imagine it's Earth size.

But don't they say in the first movie that it has 0,86 gravitational force than that of Earth? Shouldn't be much problem to walk on it in that case. Maybe it's core consists of really heavy metals and that makes up for the gravity?

Just for fun...

If g = 0.86 x Earth gravity, then g = 8.41 m s^-2

Hence, the mass must be r^2 (g/G), where r = 600 km and G = 6.647x10^-11

yielding m = 4.537x10^22 kg

If the diameter = 1200 km, then the volume is 9.05x10^17 m^3

Ergo, the bulk density is 50,100 kg m^-3

This is a bit less than twice the density of the densest known metal, osmium.

Soooo, there you go.  I'll get my coat...

Although you're not taking into account pressure and temperature of its core, the one we know nothing about  . Especially seen as we land so close as only twice as much and not for example 10^5 times more than possible. Using a little imagination does the rest 

[Winkie Bear]

1200km diameter as stated by Lambert in the Alien DC.

"Tiny."

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

Actually it makes less sense, 1200km is half the size of the Moon or eighth of the Earth. Gravity would be much smaller than that of Moon, they would have difficulty in walking/running around. I'd rather not to know the exact size and imagine it's Earth size.

But don't they say in the first movie that it has 0,86 gravitational force than that of Earth? Shouldn't be much problem to walk on it in that case. Maybe it's core consists of really heavy metals and that makes up for the gravity?

Just for fun...

If g = 0.86 x Earth gravity, then g = 8.41 m s^-2

Hence, the mass must be r^2 (g/G), where r = 600 km and G = 6.647x10^-11

yielding m = 4.537x10^22 kg

If the diameter = 1200 km, then the volume is 9.05x10^17 m^3

Ergo, the bulk density is 50,100 kg m^-3

This is a bit less than twice the density of the densest known metal, osmium.

Soooo, there you go.  I'll get my coat...

Although you're not taking into account pressure and temperature of its core, the one we know nothing about  . Especially seen as we land so close as only twice as much and not for example 10^5 times more than possible. Using a little imagination does the rest 

Pressure is the most significant factor affecting the interpretation. In the case of the Earth, the bulk density is about 5500 kg m^-3, whereas the 'uncompressed' density (i.e., what you get if you account for self compression due to gravity at depth) is around 4000 kg m^-3.  I think (and I know you're not to know, but I am a planetary scientist so I know what I'm on about) that self-compression could not bring 50,100 kg m^-3 down to the density of any known material.

I don't even care one way or the other, and certainly didn't want to get into an argument about physics versus imagination or whatever, just throwing numbers around for fun. It's what I do. Ignore it if you don't like it.

[bov930527]

1200km diameter as stated by Lambert in the Alien DC.

"Tiny."

makes sense, seeing as the explosion in Aliens looks quite big on the planet.

Actually it makes less sense, 1200km is half the size of the Moon or eighth of the Earth. Gravity would be much smaller than that of Moon, they would have difficulty in walking/running around. I'd rather not to know the exact size and imagine it's Earth size.

But don't they say in the first movie that it has 0,86 gravitational force than that of Earth? Shouldn't be much problem to walk on it in that case. Maybe it's core consists of really heavy metals and that makes up for the gravity?

Just for fun...

If g = 0.86 x Earth gravity, then g = 8.41 m s^-2

Hence, the mass must be r^2 (g/G), where r = 600 km and G = 6.647x10^-11

yielding m = 4.537x10^22 kg

If the diameter = 1200 km, then the volume is 9.05x10^17 m^3

Ergo, the bulk density is 50,100 kg m^-3

This is a bit less than twice the density of the densest known metal, osmium.

Soooo, there you go.  I'll get my coat...

Although you're not taking into account pressure and temperature of its core, the one we know nothing about  . Especially seen as we land so close as only twice as much and not for example 10^5 times more than possible. Using a little imagination does the rest 

Pressure is the most significant factor affecting the interpretation. In the case of the Earth, the bulk density is about 5500 kg m^-3, whereas the 'uncompressed' density (i.e., what you get if you account for self compression due to gravity at depth) is around 4000 kg m^-3.  I think (and I know you're not to know, but I am a planetary scientist so I know what I'm on about) that self-compression could not bring 50,100 kg m^-3 down to the density of any known material.

I don't even care one way or the other, and certainly didn't want to get into an argument about physics versus imagination or whatever, just throwing numbers around for fun. It's what I do. Ignore it if you don't like it.

Well, since I'm on my way to a major in physics myself (although I focus on particle dynamics and am not a huge fan of astronomy), I too am speaking of this from a rather critical point of a scientific view. According to a model the density of the sun's core is about a little more than 3 times this (somewhere around 160 ton /m^3). So it is considered possible to reach these numbers in some way. And yes, I did make a preposterous mistake over there, naimly comparing a dwarf planet to a core of a star, with all the implications following, I know... 

Simply knowing how much we do not know about the universe, and having run the numbers earlier myself (I do not ignore them, simply construe them in a different way) and ending with a rather possible result (like I sad, only twice as much and not say 10^5 times more, like in many, many other sci-fi movies), I simply leave the rest up to magic of fiction (since we are talking science fiction). I guess I'm one of those physicists who think nothing is impossible.

And no, I didn't want either to get in a debate over gravity/pressure (which in my experience very often leads to heated debates over sub-atomic mechanics and forces, something I got enough of at university and would very much happily avoid on my sparetime). Although I must say, the argument is really more like "possible vs plausible".

I'm saying it's possible, you're saying it's not plausible. Well, I guess the best thing then is to agree to disagree. 

Btw, awesome knowing I'm not the only physicist on the forums 

[Darth Vile]

So what's the conclusion here? For the non scientific... is it possible/probable for the planetoid in Alien to be traversable, by foot, without suffering weightlessness or being crushed  etc. etc?

[Kimarhi]

Aren't there elements from asteroids only found in said asteroids?  I thought I remember reading that somewhere.  And if that is the case, then I would think somewhere in the endless universe that a heavier element would be out there.