For a trip to the moon, it is sufficient to use liquid oxygen and hydrogen as fuel, but for a trip to Mars, more powerful fuels, like liquid methane, will be necessary. For now, it is not even clear if the Altair lander will be used for trips to Mars, or if another design will be necessary for such a spaceflight. | For a trip to the moon, it is sufficient to use liquid oxygen and hydrogen as fuel, but for a trip to Mars, more powerful fuels, like liquid methane, will be necessary. For now, it is not even clear if the Altair lander will be used for trips to Mars, or if another design will be necessary for such a spaceflight. |