Which of these methods of propulsion is “best” for future spaceflight?

[Maximum7]

Summary: Which of these hypothetical propulsion methods is the best for a spacecraft during Interplanetary flight? Let’s just assume all at this point are cost-effective at the time.

Consider the
•Safety of the engine

•The speed

•The efficiency 1.) Monoatomic hydrogen propulsion

2.) Metastable Helium propulsion

3.) Nitrogen-20 propulsion

4.) Thermonuclear micro-bomb propulsion

Looking for something humans can use for the future of spaceflight.

 

[davenn]

Summary: Which of these hypothetical propulsion methods is the best for a spacecraft during Interplanetary flight? Let’s just assume all at this point are cost-effective at the time.

…………...………..

So what do you think and why ?. How about making an effort in finding some answers yourself
Then people here can discuss with you your thoughts and reasons

 

[jim mcnamara]

Please show some research on your part. Thank you.

 

[Comeback City]

Looking for something humans can use for the future of spaceflight.

I bet you might be able to find something on eBay, just don't expect it to work

 

[anorlunda]

Since the OP has not shown any effort, I am closing this thread.