See Mercury reach its highest point in the morning sky early on Sept. 23

What time is NASA's OSIRIS-REx asteroid sample return capsule landing on Sept. 24?

Kepler predicted that Venus' diameter is almost a quarter of the Sun's diameter, so Mercury should have a tenth of the Sun's diameter. Pierre Gassendi saw the true size of Mercury in 1631 during its transit across the Sun, and was surprised by how small it was as it looked like a sunspot

OSIRIS-REx's asteroid sample will come down to Earth on Sept. 24. Here's how to watch it live.