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A new era of spaceflight? Promising advances in rocket propulsion – The Conversation UK
Three private companies have recently been commissioned to develop nuclear fission thermal rockets for use in orbit around the Moon.

The US Defense Advanced Research Projects Agency (Darpa) has recently commissioned three private companies, Blue Origin, Lockheed Martin and General Atomics, to develop nuclear fission thermal rockets for use in lunar orbit.
Such a development, if flown, could usher in a new era of spaceflight. That said, it is only one of several exciting avenues in rocket propulsion. Here are some others.
Chemical rockets
The standard means of propulsion for spacecraft uses chemical rockets. There are two main…
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