Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Constant random motion trait of particles causes even cold objects to have some thermal energy.
Which trait of particles causes even cold objects to have some thermal energy?

In science, theory is supported by much evidence, widely accepted by credible scientists, and unlikely to be disproved.
In science, what is supported by much evidence, widely accepted by credible scientists, and unlikely to be disproved?

The soho spacecraft first started to operate in 1996.
What year did the soho spacecraft first started to operate?