NASA's nuclear rocket program is making a comeback

That was missile turbojet/ramjet power, not nuclear rocket.

Do you have any Source? From what I read, it was small nuclear reactor for powering cruise missiles. Russia last year claimed that they already built nuclear powered cruise missiles
 
Do you have any Source? From what I read, it was small nuclear reactor for powering cruise missiles. Russia last year claimed that they already built nuclear powered cruise missiles
And cruise missiles are either ramjet or turbofan. In a rocket, the reactor heats a gas contained in the missile, this would be less efficient inside the atmosphere where air can be used instead of a self-contained gas.
 
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Nuclear Reactor for Mars Outpost Could Be Ready to Fly by 2022

Nuclear Reactor for Mars Outpost Could Be Ready to Fly by 2022
By Mike Wall 3 days ago Tech

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Artist's illustration of a fission power system on the surface of Mars using four 10-kilowatt units.

(Image: © NASA)

A new type of nuclear reactor designed to power crewed outposts on the moon and Mars could be ready for its first in-space trial just a few years from now, project team members said.

A flight test is the next big step for the Kilopower experimental fission reactor, which aced a series of critical ground tests from November 2017 through March 2018. No off-Earth demonstration is on the books yet, but Kilopower should be ready to go by 2022 or so if need be, said Patrick McClure, Kilopower project lead at the Department of Energy's (DOE) Los Alamos National Laboratory in New Mexico.
 
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