Although oxygen gas is colorless, oxygen in liquid and solid form is a pale blue color.
This is because the low density (low concentration of molecular oxygen) in the gaseous state precludes the collision of electrons with photons, and therefore their excitation and return to ground state that emits color.
I hope everyone is excited for Moley Moley Moley Mole!
That's right! Hess will be hosting a Giant Mole Mass (NM or HM up to participants) half an hour after reset, at 8:30 PM EDT! Join him to scratch the itch of this group boss that is surprisingly fun with friends, up your KC, and hopefully gain log progress!
The constantly expanding universe is getting colder.
The simplest explanation for this is by considering that the net energy content of the universe is a constant. Therefore, the same amount of energy is spread out, and the transference of thermal energy is diluted.