All Stories by Charles Petit
- Physics
Invisibility Uncloaked
In the race to make things disappear, scientists gain ground on science fiction.
- Astronomy
The Star That Ate a Mars
COVER STORY: Scientists probe debris trapped by white dwarfs to learn more about what faraway Earthlike planets are made of.
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Cold Panacea
Two researchers proclaimed 20 years ago that they’d achieved cold fusion, the ultimate energy solution. The work went nowhere, but the hope remains.
- Astronomy
Ultramassive: as big as it gets
A black hole can consume anything in its path. These monsters can become huge — but perhaps only so huge.
- Space
Black holes have limits
A review of current evidence suggests an upper limit to a black hole's size.
