The Sun
Cosmic Variance reminded me of this image.
It's not very good quality, but then it is taken in neutrinos. To stand a decent chance of catching a neutrino you need to put something like a light-year's worth of lead in its way. To get that in perspective, a light year is about the distance you'd get if you put a billion Earths in a line.
This also means you can take this photograph of the sun at night (well, you'd want about two year's worth of night using the 50,000 tons of water in the Super-Kamiokande experiment to do it), because the neutrinos can just go straight through the Earth.
It was an APOD back in 1998.
It's not very good quality, but then it is taken in neutrinos. To stand a decent chance of catching a neutrino you need to put something like a light-year's worth of lead in its way. To get that in perspective, a light year is about the distance you'd get if you put a billion Earths in a line.
This also means you can take this photograph of the sun at night (well, you'd want about two year's worth of night using the 50,000 tons of water in the Super-Kamiokande experiment to do it), because the neutrinos can just go straight through the Earth.
It was an APOD back in 1998.