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I think this is a frost flower, crystallofolia, closely related to hair ice. They can appear quite similar to the above photos. … This makes more water arrive, displacing the ice outwards forming long petals along cracks, ridges or other structures. …

The nice ice crystals in the picture tend to form on surfaces where there is only a small amount of water (or water available as vapour in the air). … They grow in competition (leaving contrasting empty space where there is no ice) and have ice form preferentially at their tips (producing dendritic patterns). …

Pack them in a thermos flask, where the vacuum between the walls prevents easy heat conduction from the inside to the outside. Then put it in a working fridge. Then launch the fridge into space (behin …

Ice has heat of fusion $H= 333$ J/g: you need 333 J to melt one gram. So if all the laser pointer energy went into melting ice, it would melt $P/H=$0.0003 to 0.0009 g/s. … Ice absorbs about 2% of light per centimetre, so the ice cube would presumably just scatter the remaining 98% of the laser energy. …

Ice VII occurs above 3 GPa. Pressure at depth $z$ is $p =\rho g z$, so the critical depth for $\rho=1050$ kg/m$^3$ is $z=290,951.4$ m. So we need a 291 km deep ocean to get high pressure ice. …

Congratulations, you found an inverted pyramid ice spike, sometimes called an ice vase! … If the freezing rate is high enough the expansion of ice under the surface will increase pressure (since the ice is less dense than the water and displaces more volume), and this forces water up through …