[Wuli]

I wonder how much “lighter” it is in terms of pounds, ounces, kilograms, grams and such. Why? Nuclear powered space travel.

[Red Badger]

The new uranium-214 isotope had a half-life of just half a millisecond, meaning that's the amount of time it takes for half of the radioactive sample to decay. The most common isotope of uranium - called uranium-238 - has a half-life of about 4.5 billion years, which is about the age of Earth.

[alexander_busek]

I wonder how much “lighter” it is in terms of pounds, ounces, kilograms, grams and such. Why? Nuclear powered space travel.

U-214 would be almost exactly 214/238 as dense as U-238.

Since U-238 has a density of 19.1 grams per cm3, that comes to about 17.1 grams per cm3.

However, as others here have pointed out, the extremely short half-life (measured in milliseconds) would make storage a problem (/understatement).

Regards,