The Naked Scientists

The Naked Scientists Forum

Author Topic: What makes a planet unable to sustain life?  (Read 2848 times)

Neil

  • Guest
What makes a planet unable to sustain life?
« on: 05/07/2008 13:11:11 »
Neil asked the Naked Scientists:

Hi,

I was looking in your forums and saw a discussion on UFOs, over life in the universe etc.

It got me thinking. Why do you often hear 'experts' saying that a planet is unable to sustain life? What are they basing that on?

Are they saying that all life forms must be carbon based and assuming that, for instance, gaseous life forms simply couldn't exist somewhere?

Thanks

Neil

What do you think?


 

Offline LeeE

  • Neilep Level Member
  • ******
  • Posts: 3382
    • View Profile
    • Spatial
What makes a planet unable to sustain life?
« Reply #1 on: 05/07/2008 15:12:30 »
I think it can only be assumed on the basis of "not as we know it (Jim) and there has been a lot of speculation about lifeforms based upon other elemants.  Gaseous lifeforms have been hypothesed quite plausibly in a couple of Sci-fi novels, one of the best being in Iain M. Banks 'The Algebraist'
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8125
  • Thanked: 53 times
    • View Profile
What makes a planet unable to sustain life?
« Reply #2 on: 05/07/2008 15:53:47 »
The presence liquid water seems essential for life,
so areas of the universe too hot or too cold for liquid water to exist are considered uninhabitable.
« Last Edit: 05/07/2008 15:58:53 by RD »
 

Offline syhprum

  • Neilep Level Member
  • ******
  • Posts: 3818
  • Thanked: 19 times
    • View Profile
What makes a planet unable to sustain life?
« Reply #3 on: 05/07/2008 17:25:48 »
So why are they wasting time and money searching on Mars?.
 

Offline RD

  • Neilep Level Member
  • ******
  • Posts: 8125
  • Thanked: 53 times
    • View Profile
What makes a planet unable to sustain life?
« Reply #4 on: 05/07/2008 23:44:58 »
So why are they wasting time and money searching on Mars?.
http://mars.jpl.nasa.gov/msp98/why.html
 

Offline Alan McDougall

  • Neilep Level Member
  • ******
  • Posts: 1285
  • Thanked: 14 times
    • View Profile
What makes a planet unable to sustain life?
« Reply #5 on: 06/07/2008 08:53:42 »
Silica based life is a far off possibilty. Maybe plasma based life living on the Sun?
 

Offline Alan McDougall

  • Neilep Level Member
  • ******
  • Posts: 1285
  • Thanked: 14 times
    • View Profile
What makes a planet unable to sustain life?
« Reply #6 on: 07/07/2008 23:50:26 »
 Lack of Water the stuff of life
« Last Edit: 07/07/2008 23:58:46 by Alan McDougall »
 

The Naked Scientists Forum

What makes a planet unable to sustain life?
« Reply #6 on: 07/07/2008 23:50:26 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums
 
Login
Login with username, password and session length