Scientists are proposing an unproven way to tackle climate change by spraying sun-dimming chemicals into the Earth's atmosphere.
A test of revolutionary new aviation technology could reimagine aerial warfare by ushering in silent drones and undetectable aircraft.
Multiple UFO sightings filmed over the Gaza Strip
NASA has teased a return to the Moon and even has plans to go farther than our lunar satellite and head to Mars.
A passenger on a commercial plane has filmed a UFO while flying over San Francisco.
Interesting footage of an unknown craft hovering in the night sky over a beach
New video footage of an unknown object hovering in the sky above Gothenburg, Sweden
A resident of Budapest filmed these strange objects flying over Budapest's cathedral in the live feed.
New video footage of multiple unknown lights flying in the sky above Braunfels, Texas