Isaac Newton

Our solar system officially houses eight planets, but some scientists say there could be a ninth hiding on the fringes. Now, a new study has found the oddities could be explained by modified theories of gravity, an alternative idea to dark matter.

Astrophysicists have observed puzzling behavior in star clusters that defies our current understanding of gravity at cosmic scales. Intriguingly, the observations fit with an alternative theory of gravity that could negate the need for dark matter.

The 2021 auction market was quite extraordinary, with unprecedented levels of participation and sales. From cars to colt revolvers to multi-million-dollar NFTs, this sweeping look at the highlights is full of fascinating tales and astonishing prices.

It would be reasonable to expect a slow year at auction for science, technology and science-fiction, but 2021 is on track for a record, with a slew of knowledge-related objects of note hitting the auction block in recent weeks.