Nitrous oxide – Not a laughing matter

Winner Takes All: Galaxies Headed for Collision on Intergalactic “Road of Matter”

Galaxies Are Headed For an Epic Collision on a Cosmic Matter Highway

Galactic 'bridges' could be the largest rotating structures ever discovered. Astronomers have uncovered evidence that cosmic filaments – tendrils of matter that stretch across hundreds of millions of light years – are also spinning. Rotation on such gigantic scales has never been observed before.