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If large black holes are at the heart of most galaxies and they are dark by definition and we have no way to tell what their size is, couldn’t they be hiding enough mass to make up the missing mass in the universe? Georges KaufmanTampa, Fla. A central black hole would not cause the visible […]
- Astronomy
Votes cast for and against the WIMP factor
Physicists this week duked it out over a bunch of WIMPs, elementary particles that—if they exist—could solve a decades-old mystery in cosmology and help unify the four fundamental forces of nature.
- Chemistry
Power plants: Algae churn out hydrogen
Green algae can produce hydrogen, a clean-burning fuel that could one day power pollution-free cars.
