Wall Street is rising toward more records on Monday at the start of a week that could show whether the U.S. stock market's big recent rally ...

At just 25, Cecilia Payne-Gaposchkin applied quantum physics to a treasure trove of astronomical observations to show that stars are mostly hydrogen and helium.

Asteroid deflection could backfire if the impact shoves the rock into a cosmic keyhole, a hidden trapdoor in space.