Question

What is the main "hitch," or problem, in getting fusion to occur?

Answer 1

The main problem is achieving ignition to start the reactions. Fusion reactions can occur only at extremely high temperatures.

Step-by-step explanation:

Answer 2

Answer: working with intense pressure and heat

Explanation: you would you have to work with intense pressure and heat in order to fuse two hydrogen nuclei together to create helium isotopes.