Some scientists posit that a particular type of comet called a centaur that is not being monitored could pose a greater risk to Earth than an asteroid impact.
NASA has delayed and may cancel its next planned Mars mission, which was to study the planet's interior, because of a broken vacuum seal.
The composition of volcanic lunar rocks could say something about the history of our moon.
Previously thought to be extinct, two sea snake species appeared off the coast of Western Australia.
Genome editing technology is moving at a 'breakneck pace,' faster than the ethical discussions it provokes, says biochemist Jennifer Doudna.
Wild bees are key pollinators for agriculture across the United States, especially as managed honeybees face devastating declines. But these wild pollinators are struggling too. Can we save the bees?