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Black hole puzzles
After Stephen Hawking’s death in March, scientists reflected on the famed cosmologist’s theories, including Hawking radiation, Emily Conover reported in “How physicists will remember Stephen Hawking” (SN: 4/14/18, p. 12).
In theory, Hawking radiation occurs when one member of a particle-antiparticle pair becomes trapped inside of a black hole, allowing the partner to escape. Many readers wondered how Hawking radiation could cause a black hole to evaporate over time. “It seems the black hole would be increasing in mass by the amount of energy contained in the particle it has just captured,” reader Larry Gioannini wrote.
A particle can escape only if its trapped partner has negative energy, Conover says. “When a black hole absorbs a negative energy particle, that particle actually takes away some of the black hole’s energy,” she says. “Because energy and mass are equivalent in physics, according to Einstein’s theory of special relativity, the black hole loses mass. So it will disappear if this process continues long enough.”
Scientists get real
In her editor’s note “How many scientists do you know in real life?” (SN: 4/14/18, p. 2), Science News Editor in Chief Nancy Shute wrote that the scientific and science journalism communities have more work to do to connect the public with scientists.
Shute’s note resonated with readers.
“Great to see that the organization recognizes the separation between scientists and the general public,” reader Charles Martin wrote. “Also great to see that SN recognizes that it is the scientific community’s place to change that. Presentations at schools are great but don’t really reach the general public. SN issues are one way, but why not consider a ‘know a scientist’ program nationwide? Think of the possibilities.”
The editor’s note stirred up memories for reader Carolee Metcalfe Wende. She recalled explaining to her young son that his father, a solar physicist, was a “doctor of the sun.” “My son’s face lit up with this most wonderful news! I think for the next year or so, he thought that his awesome father had something to do with the sun rising every morning,” she wrote. Metcalfe Wende, a microbiologist, also recalled a plaster test-tube holder that her son made for her. “I had it with me at work every day for the rest of my career,” she wrote. “Thank you so much for bringing it to people’s attention that even though not all scientists are as notable as those mentioned in the article, we indeed are all around, all the time, living normal, everyday lives.”