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How much water does the Earth lose to space ?

The water on Earth is supposed to be in a closed system : no matter how much gets drank, urinated, poured on plants, rained, drained into the sea, and all other things, the net amout of water on Earth will stay the same. But, since the beginning of the space age, we have been sending water up with rockets into space. How much water does the Earth lose every year in this way ?
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  • Asked by Wall-e
  • on 2011-09-10 20:28:27
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Categories: Planet Earth.

Tags: water, Space, Earth, Planet, rocket, loss, Lose, Astronaut.

 

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Why are all the planets in our solar system aligned in the same plane?
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  • Asked by Oundle
  • on 2011-09-01 11:37:19
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Categories: Our universe.

Tags: Space, Universe, sun, SolarSystem, plane, Planets, Galaxy.

 

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Interstellar exploration using nanobot

Is it possible in thoery, to create a nano sized probe that can be accelerated close to the speed of light to reach our nearest star relatively quickly, eg. using similar methods to particle accelerators?

The probe would obviously require a power source, sensors and transmitter to send signals all the way back to Earth.

 

 

 

 

 

 
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Categories: Our universe.

Tags: Space, acceleration, Travel, nano, accelerator, probe.

 

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Would spacecraft re-entry be easier if the retrorocket phase was fiercer?

Re-entry for a spacecraft is presumably hard because the ship is going so fast and is slowed by the friction of the atmosphere.

Wouldn't it be a lot easier for the spacecraft if the retro-rockets were fired more fiercely and for much longer?  Is there a reason why this isn't done, apart from needing to carry more fuel? 

 

 
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Categories: Transport.

Tags: Space, spacetravel.

 

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Rock on

I read that an asteroid with a diameter somewhere between 8 and 18 metres passed within 12,000 kilometres of Earth on 27 June. To what extent would its course have been affected by this brush with the Earth's gravitational field?

Pedro Soler, Menorca, Spain
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Categories: Our universe.

Tags: Space, Earth, gravity, asteroid.

 

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No one can hear you sniff

I've heard that being in space supresses your sense of smell. If so, why?

Paul Maddox, Oslo, Norway

 
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Categories: Human Body.

Tags: Space, smell, nose, sniff.

 

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If earth came out from gravity and orbit

Suppose earth came out from orbit and gravitation and then falls downward in space then where it stops or land? what is down ward in space if we taken reference as earth is there any planet or alien world is there.
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  • Asked by munna
  • on 2011-06-18 10:29:05
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Categories: Our universe.

Tags: Space, orbit.

 

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Driving at the speed of light

I know this is obviously hypothetical, but if you were driving in your car faster than the speed of light, and flicked your headlights on, were would that light go? also what would happen if you did the same thing travelling at exactly the same speed as light?  
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Categories: Our universe.

Tags: transport, Space, light, speed, car, Travel, headlights, travellling.

 

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Methane rain falls on Titan. What colours would be seen in a rainbow (if any)?
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  • Asked by pinot
  • on 2011-04-01 09:59:24
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Categories: Our universe.

Tags: weather, Space, Rainbows, methane, Titan.

 

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MOND: Gravity bends on gravity?

As per article posted on New Scientist and on other sites (http://www.physorg.com/news/2011-02-gas-rich-galaxies-gravity-theory.html)

Does this mean that gravity bends on gravity as well?
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Categories: Our universe.

Tags: Space.

 

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