[coloradan]

I wouldn’t exactly call 2 MeV photons “low energy”. Those photons come from a blackbody at 24 billion degrees K.

[Wonder Warthog]

"I wouldn’t exactly call 2 MeV photons “low energy”. Those photons come from a blackbody at 24 billion degrees K."

Yes, but the idea is to not need "24 billion degrees" to get the photons to generate fusion sufficient to deliver usable energy for society.

[PapaBear3625]

Compared to what astronomers see, 2 MeV is not hugely high.

https://phys.org/news/2021-07-astronomers-ultra-high-energy-gamma-ray-source.html

Sources emitting gamma radiation with photon energies between 100 GeV and 100 TeV are called very-high energy (VHE) gamma-ray sources, while those with photon energies above 0.1 PeV are known as ultra-high energy (UHE) gamma-ray sources. The nature of these sources is still not well understood; therefore, astronomers are constantly searching for new objects of this type to characterize them, which could shed more light on their properties in general.