If it was composed of solid hydrogen then very little. It would evaporate at slightest touch of a planets atmosphere. Maybe even bounce off it. For solid hydro

If it was composed of solid hydrogen then very little. It would evaporate at slightest touch of a planets atmosphere. Maybe even bounce off it. For solid hydrogen any planet with atmosphere is like a ball of hot molten lava for a snowball. Edit: I was half expecting there to be a video of throwing snowballs into lava, Internet does not have it all, yet.