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Close-up of an old wavy glass window pane with uneven thickness

Glass is a solid. Full stop.

Is Glass a Liquid?

Glass is a solid. The old window thickness myth is wrong. Here is what glass actually is, why old windows are uneven, and what a supercooled liquid actually means.

glassliquid
Deep space image showing distant galaxies surrounded by apparent darkness

Nothing is truly empty

Is Space Completely Empty?

Space is not empty. It contains gas, dust, radiation, magnetic fields, dark matter, and quantum fluctuations. The emptiest regions still have something in them.

spacevacuum