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Steelmaking is a major source of emissions. These companies are racing to fix it.
Featured in Telescopes
With the arrival of Africa’s next radio telescope, Namibia sees a new dawn in astronomy
The upcoming addition to the Event Horizon Telescope network will unlock cosmic secrets—and new doors for the next generation of Southern African astronomers.
Liquid lenses could make NASA’s next space telescope even more powerful than Webb
Spheres of liquid polymers in microgravity are key.
The most distant galaxy we’ve ever discovered might have closely followed the Big Bang
Astronomers have two explanations for why it still shines so bright.
NASA’s official exoplanet tally has passed 5,000 worlds
There are only a few hundred billion planets left to find in the Milky Way.
Travel to another galaxy with this vibrant 3D map of the cosmos
The map is made from radio telescope observations of millions of objects in the sky.
See the heart of the Milky Way as it’s never been captured before
These photos have everything: supernovas, non-thermal filaments, and a massive black hole.
NASA’s James Webb telescope will peer through the haze of other worlds
It should help astronomers understand some of the galaxy's most abundant planets.
What we can learn from baby black holes
The quasar J0313-1806 is 13 billion light-years away from Earth. But it still can reveal a lot about our own universe.
These two galaxies are locked in a cosmic battle
Galaxies millions of light years away show what could happen between the Milky Way and its neighbor, Andromeda.
6 common mistakes first-time stargazers make, and how to avoid them
Meet your new favorite hobby.
