Nope, if the sun was suddenly switched off, then life on earth wouldn’t be possible. The sun warms the planet, without the sun the temperature of the Earth would plummet to just above absolute zero (-273.15°C), warmth only coming from the core of the planet (but it is a tiny amount of heat).
But the sun also is the reason why plants can photosynthesis to make energy and also to replenish the oxygen in the atmosphere. Also without the sun’s energy there would be no weather, as water wouldn’t be evaporated to form clouds and eventually rain.
So, the sun is our biggest friend in the sky, our nearest star and the reason we can live today!
I would pretty much agree with James P – without the sun’s energy life would be pretty challenging. However, it’s possible that some life could exist, around things like volcanic vents on the ocean floor. Such so-called extremophile organisms (called extremophile because they appear to love extreme conditions) can live without the sun because they use the heat from the vents for energy, rather than the sun. Some scientists believe that all life started out like this, before plants later evolved photosynthesis and were able to get their energy from the sun. Also, extremophile organisms might be our best bet for finding life on other planets and moons.
However, these extremophile organisms are mainly single celled bacteria. There’s no way complex animals like us could have developed without the sun.
Like James Verdon said there is life that exsists around volcanic vents that occur deep down in the oceans where there is no sunlight. There is a type of bacteria that instead of using the sun for photosynthesis they use the gases coming out of the vent such as hydrogen sulphide to provide energy in a process called chemosynthesis. These bacteria form biofilms, like a mat of bacteria all joined together. tiny creatures called amphipoda feed on these mats and then large types of creature such as worms, snails, crabs and shrimps even octapus feed on the tiny creatures.
But would this life be maintained if there was no oxygen in the oceans? With no sun the oceans wouldn’t have a way of producing free oxygen (no plankton to photosynthesize) and replenish the oxygen?
Many of these critters respire anaerobically, and oxygen is actually toxic to them. Certainly, when life first emerged there was minimal oxygen in the atmosphere and oceans, so the earliest life forms would have been chemosynthesisers.
Like I mentioned and James V has said they use sulphur compounds in exchange for oxygen compound to produce energy. 5000 metres down, there must be little oxygen and light but these guys survive.
Comments
ba5h commented on :
james p the words photosynthesize not photosynthesis
in sunlight
James P commented on :
James V and Gemma,
But would this life be maintained if there was no oxygen in the oceans? With no sun the oceans wouldn’t have a way of producing free oxygen (no plankton to photosynthesize) and replenish the oxygen?
ba5h oops 😮
James V commented on :
Many of these critters respire anaerobically, and oxygen is actually toxic to them. Certainly, when life first emerged there was minimal oxygen in the atmosphere and oceans, so the earliest life forms would have been chemosynthesisers.
Gemma commented on :
Like I mentioned and James V has said they use sulphur compounds in exchange for oxygen compound to produce energy. 5000 metres down, there must be little oxygen and light but these guys survive.
http://www.newscientist.com/article/dn21340-deepest-known-black-smoker-vent-discovered.html
http://bcove.me/st23pahx