if they could find planet with strong atmosphere, close 2 sun, water & carbon dioxide could they plant plants?
148940
I think it would only be possible if there was also lots of water on the planet as well as good solar radiation being close to a star and carbon dioxide. Also it would be helpful if there was nitrogen in the soil since plants absorb nutrients from the soil. There would also need to be rainfall on the planet, but if there wasn't irrigation and watering by caretakers could be sufficient.\n\nAnd what about terraforming? Mars has an atmosphere and I beieve carbon dioxide. Could plants grow on Mars? We'd have to transport millions of gallons of water in our ships and keep the water from sinking deep into the planet. Why would we want to do that? It could cost a trillion dollars. The moon has no atmosphere I'm not sure it could be terraformed. Just a thought.
332737
This is interesting question. My opinion is: why not!! Maybe some forms of life that we don't know. There is some life forms even 11 km under the sea, under extremely high pressure. Some kinds of bacteria live without air too. Fish don't use the same air like us, but they are alive. There is so many different forms of life even on planet Earth, so why not on other planets? After all, if we did not see something, don't mean this don't exist!
433514
Possibly, but i believe venus is a better candidate.  The higher gravity of venus (very earthlike) would allow it to sustain an atmosphere like ours if we can solve 2 other problems...more solar radiation, and a retrograde day that is months long.\n\nThe L.O.V.E. project (Life On Venus Enhancement) I made this up when i was a kid:  solution 1 - put lightweight, but very large reflectors into orbit around venus, on the day side they will block light in a 24 hour pattern, on the night side they will provide sunlight in the same pattern.\n\nsolution 2 - release into orbit around venus a cloud of particles to reduce the solar radiation and also use the reflectors/shades described above.\n\nAs the temperatures approach earthlike conditions, introduce water (capture a comet probably, or change it's orbit subtly to get it to venus.)\n\nIt's possible there is substantial water on venus tied up in some chemical situation or another, we don't know enough about it.\n\nand btw, for the other answers claiming mars is too hot, um, no?
374457
yes - sunlight penetrates through the atmosphere and in converted to infrared radiation, which is trapped by gases in the atmosphere such as CO2, CH4 and N2O.
964282
Well, since the only planet that we known absolutely, positively has green vegetation is the Earth, then all measurements of the speed of light here in the atmosphere are in the presence of green vegetation.\n\nAs far as any astronomical, deep space observations -- heck, we've only just detected Jovian-class planets in other solar systems.  No known vegetation there!\n\nSo, I'd have to say that the answer to your question is no, we've not made any observations of the type you describe.
827505
No other planets are habitable for humans.\n\nMercury and Venus being far too hot.\n\nJupiter, Saturn and Neptune for being gas giants and so has no solid surface. The gravitational pull of these planets would crush our bodies. Juipters gravititational pull is over 300 times the earth.\n\nPluto is too far away thus seeing temperatures of over -200 degrees C.\n\nMars would have been a perfect candidate, as the temperature is quite similar to earth's at occasion. But our lifes need plenty of water and the abundance of water on Mars is basically zero.\n\nFor other life than humans, a moon called Europa, which orbits Saturn, contains frozen methane and water, which could harbour life. The only problem is its a moon and not a planet.\n\nThere are all the other planets (approximately 250 so far discovered) in the Keiper Belt which need to be examined
602001
Probably not. The Solar system is a system in balance. The Sun's gravity keeps the orbits of the planets stable. Gravitational attraction between the planets also effects their orbits, exerting the same force as the Moon exerts on the Earth's oceans. The gas giants, especially Jupiter can\ncreate "tides" that can tear a smaller planet to pieces, over time. There once was a "theory" that the asteroid belt, between Mars and Jupiter, consists of pieces of a planet called, I believe, Vulcan. If Mars WASN'T there, the\nearth would probably be located farther out from the Sun.\nVulcan might not have broken up, and would be orbiting a little closer to the Sun, but not as close as Mars. Bottom line: Earth, outside the "comfort zone" would probably be TOO COLD to sustain life.\n\nMoral of the story? Things are the way they are for a reason.
697611
Yes, plant cells need mitchondria to survive.
13750
plant more trees -> more ozone layer -> less UV rays -> cooler planet -> less melting of the polar sides of the earth
11147
You could use a catalyst to turn CO2 into a oxygenate.\n\nPlants would be the most efficient and cheapest way possible as far as I know. But plants won't just grow on mars, you would need to make the conditions suitable for plant life to survive. I think they were talking about man-made global warming to increase the atmosphere and warm it up for possible teraforming. \n\nAlso, there is water on mars already and why would you want it to rain carbon?
178231
G'day good question!!\nWell I'm all for space exploration, cos in the very long term it will be important for us to leave this place, scientists believe that places like Mars actually contain water in the soil in the form of Perma Frost, and if it could be released then perhaps we could live there one day. The giant moon of Jupiter ( Europa) is covered in a sheet of ice, what is under the ice is not known, perhaps a type of life form ( now that would create all sorts of questions don't u think?)
952186
It's generally true that the further the Earth were from the Sun, the colder it would be, and the closer the warmer.  However, this is not necessarily the most important factor.  For example, the Earth is closer to the Sun when it is winter in the Northern Hemisphere, not further.  But the winter is cold because the Northern Hemisphere tilts away from the Sun at this time.  In a nearly circular orbit, the tilt of the axis is a stronger effect than the orbit's eccentricity.  However, with all other things equal, the planet's temperature would vary with distance from the Sun.\n\nThe Sun has a range of orbits around it that are considered a "habitable zone."  The Earth could have different orbital distances within this range, and life on Earth could theoretically continue, but probably with great disruption to the ecosystem.  Not all species would survive.  Humans would have a good shot because we could use technology to warm or cool our enviornment as needed.  Closer to the Sun that the habitabile zone, the heat and radiation are too intense for life as we know it.  Further away, the heat and light available are insufficient to sustain life.\n\nEarth could quite possibly exist as a habitable planet in the orbits current occupied by Venus and Mars.  Venus is extremely hot, but much of that comes from Venus' runaway greenhouse effect that makes its surface hotter than that of Mercury, which is closer to the Sun.  Mars is rather cold, but that is partly due to the planet's lack of greenhouse gases, preventing it from retaining the Sun's energy to the extent that Earth does.
630213
We know that Earth has life on it so that is the most likely.\n\nMars is also a possibility although I would not expect the life to be alive when we get there (but it might be possible for us to thaw it out) due to the apparent lack of water and the atmosphere being a bit too thin.\n\nEuropa might have life under the ice in a liquid water layer.  It would seem to be big enough for life to evolve and the materials that are needed for life would actually be able to exist in forms that life could use along with the tidal heating from Jupiter.  This is probably the most likely place to have life but it isn't a planet.\n\nTitan has a rather thick atmosphere and organics so it looks like a candidate although it is a bit cold and doesn't have any liquid water (though hydrocarbons might be able to substitute) so a different biochemistry might be needed.  Of course this isn't a planet so it doesn't actually answer the question.
779075
Close because the plant takes in CO2 and so it will prevent any CO2 from leaving the cell because it need them to carry out photosynthesis. Once they have enough, the stomata are closed so that they don't escape.
1116083
Venus is a special case.  Most planets would cool very quickly becoming a very inhospitable place.  Venus is however experiencing a run away greenhouse effect.  It is very well insulated and would take some time to radiate it's heat away.  Eventually it would succumb to the cold however.
593341
there is water ..\n\nthere is some bacteria life ... \n\nmost planet look almost the earth ...\n\nhave  nitrogen  and  hydrogen and littel oxygen\n\ngood luck to ur project
1077788
Life on other planets is possible. Think about the billion other planets out there. Scientist have discovered that there are other planets capable of sustaining life, even if there weren't, plants can grow in space, therefore ecosystems can be built on other planets to produce oxygen. How long will it take us? As long as we realize we are all humans and we stop fighting over oil and money.