Nuclear thermal rocket?

[Mik]

https://www.msn.com/en-us/news/technology/the-pentagon-s-nuclear-thermal-rocket-is-getting-serious/ar-AAXayUl?ocid=msedgdhp&pc=U531&cvid=4372b2eb55694167a2916c126e0c8994

[George K]

What we need is the Epstein Drive.

If you could provide constant acceleration at 1g a trip to the moon would be a matter of 3 hours allowing for the deceleration phase, also at 1g.

Mars? About 2 days. Jupiter is 5 days.

https://space.stackexchange.com/questions/840/how-fast-will-1g-get-you-there

These times are, of course for when the planet is closest to Earth, so ymmv.

[jon-nyc]

The Epstein Drive doesn’t power itself.