When the astronomer Charles Messier first observed this cluster in the 18th century, he mistook it for a starless nebula, or a cloud of dust and gas.
The concept of atoms had been floating around off and on for a few millennia, but it took some clever experimentation to pinpoint their existence.
If the White House's proposed 2020 budget is enacted, NASA won't have the money to develop an ambitious, big-budget space telescope for the foreseeable future.
A new image from the European Southern Observatory captures a cosmic bat tucked away in one of the darkest corners of the Orion constellation.
The CHIME radio telescope aims to explain two poorly understood cosmic phenomena, one dating back to the early universe and one taking place today.
A gigantic solar storm hit Earth about 2,600 years ago, one about 10 times stronger than any solar storm recorded in the modern day, a new study finds.
A particularly odd, spinning star has woken up, and it's spitting bright flashes of radio waves at us again.
IBEX is helping astronomers figure out where the edge of our solar system ends and the rest of space begins.
During a hearing held by the House science committee, congressional representatives questioned the wisdom of cutting NASA's outreach and education office.