Astronomers still don’t know exactly what the sun is made of
For two decades, astronomers have argued over how much carbon, nitrogen and especially oxygen lie within our closest star — a dispute with implications for the entire universe.
Decades since the last great comet show, a promising candidate breaks down
The comet, known as C/2019 Y4 (ATLAS), has shown signs of falling apart, and is no longer expected to treat stargazers in the Northern Hemisphere to a spectacular show.
New 3D maps of the Milky Way confirm our galaxy is warped
It turns out our Milky Way galaxy isn't the flat spiral disk we thought it was before -- dark matter or collisions with other galaxies could have twisted it out of shape.
Did the birth of the solar system make meteorites? Here’s a tell-tale clue
Despite decades of intense study, there is no general consensus on how most meteorites formed. An astronomer and a geologist offer a new theory of what happened during the solar system's birth to create these valuable relics of our past.
Imaging scientist Katie Bouman chats with the PBS NewsHour about how she crafted an algorithm that constructed the first ever photo of a black hole.
On Wednesday, the Event Horizon Telescope released the first-ever image of a black hole, a historic moment shared by scientists spread around the world.
The Event Horizon Telescope is expected to release the first image of a black hole on Wednesday. In preparation for what might be a momentous day, here’s what you need to know.
The iron core of what was once a world has been found around a white dwarf star, shedding light on the final days of planetary systems — including our own.
Comet 46P/Wirtanen is expected to make an appearance Dec. 14 to 19 that may well be visible even to the naked eye. Photo by Suchart Kuathan/via Getty Images…
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