I'm excited to reconnect with the design and manufacturing engineering research community at ASME's IDETC-CIE 2022 in St. Louis! https://t.co/qD0VYTCbVc
If you touch two CLEAN blocks of the same metal together in space, they weld!
Atoms in solid metals move a bit. Touch two clean surfaces together, and the atoms can't tell they're in different blocks so they become one group of atoms, ie ONE SOLID.
(Gif: https://t.co/8YZxHWYoZP)
The Andromeda Galaxy is flying toward our Milky Way at about 110km per second (68mi/s), this computer simulation depicts the titanic collision predicted to occur in about 4.5 billion years.