A state of carbon in which the atoms are arranged in layers, graphite is a solid on Earth and in space. Very small particles similar to graphite, like carbon atoms, have been observed in comet comas and tails. At standard temperature and pressure on Earth, methane is a gas. Methane has been observed in comet comas. The solid rocky part of a comet.
Sodium is a solid on Earth.
In the cold vacuum of space, it is also a solid, probably in the form of a chemical compound. When hit by sunlight, sodium becomes a gas. Sodium has been observed in comet tails. Silicone dioxide is a solid on Earth and in space. It is found in rocks, and is the primary ingredient of sand on Earth.