TerraChoice also measured green advertising in major magazines and found that between 2006 and 2009, the number mushroomed from about 3.5% of all ads to just over 10%; today, Case says, the number is probably higher still.
NASA bought hydrogen at 98 cents per gallon. A gallon of liquid hydrogen weighs 0.2679 kg, so they paid $3.66 per kg for liquid hydrogen. NASA bought oxygen at 67 cents per gallon. A gallon of liquid oxygen weighs 4.322 kg, so they paid $0.16 per kg for liquid oxygen. 384,071 gallons of liquid hydrogen in the external tank of the shuttle, for a cost of $376,389.58. ~141,750 gallons of liquid oxygen for a cost of $94,972.50. The total cost of all propellant for rocket fuel is $1,380,000. These numbers exclude the hydrogen and oxygen used for cooling, etc.
You can reasonably assume rocket fuel is at least 5 to 10 times more expensive than that, or $2500 to $5000 per ton. So letâs start the planning. Step 1: Since weâve assumed that our Mars spacecraft is already in LEO, we need to get it into a high Earth orbit.ompare this with a one-way trip that only required 7 tons/ton of payload. The bottom line of all these calculations is that you can get about eight times as much stuff to Mars for the same amount of fuel if you send it one-way instead of trying to bring it back!