If you dump your pet goldfish into a lake, it will grow into an enormous pest and other top stories.

• If you dump your pet goldfish into a lake, it will grow into an enormous pest

  

  Renegade goldfish have been a problem all over the world. (Rebecca Baldwin/Alberta Environment and Parks) Consider this your annual reminder: Don't dump your pet goldfish into a lake. Invasive species are, generally speaking, not so great. When an organism moves into a territory where it lacks natural predators, it can interrupt the entire ecosystem by scarfing down local resources and killing important species. You've probably heard of a few of these troublemakers: Goats, placed on the Galá..

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• Space, Climate Change, and the Real Meaning of Theory

  

  I used to be an astronaut, a spacewalker on the International Space Station. Naturally, most of my fifteen-year crew career was spent on the ground, working with engineers to get the Station built and fully crewed for scientific research, but the day-in, day-out flow of this ground work was punctuated by the occasional illuminating, even eye-shattering experience, when I was launched into orbit and saw Earth through my spacesuit visor. The Station goes around the world in an hour and a half, wh..

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• Model Black Hole Recreates Stephen Hawking Prediction

  

  Black holes got their name because light can't escape them, beyond a certain radius—the event horizon. But in 1974, Stephen Hawking proposed that quantum effects at the event horizon might cause black holes to be…not completely black.  "Hawking said that pairs of particles should be created at the event horizon." Jeff Steinhauer, a physicist at the Israel Institute of Technology. "One particle exits the black hole and travels away, perhaps to Earth, and the other particle falls into the black ho..

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• Watching a star explode after 'hibernating'

  

  Photos: Wonders of the universeA classical nova occurs when a white dwarf star gains matter from its secondary star (a red dwarf) over a period of time, causing a thermonuclear reaction on the surface that eventually erupts in a single visible outburst. This creates a 10,000-fold increase in brightness, depicted here in an artist's rendering. Photos: Wonders of the universeGravitational lensing and space warping are visible in this image of near and distant galaxies captured by Hubble. Photos:..

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• Retirees Find Second-Oldest Confirmed Shipwreck in Great Lakes

  

  Aug. 18, 2016 5:30 a.m. ET A group of retirees who hunt for sunken ships in their spare time scored a huge find far below the surface of Lake Ontario in late June: the second-oldest confirmed shipwreck in the Great Lakes, a 53-foot sloop named the Washington that sank in a storm in 1803. “We’re always excited,” said  Jim Kennard, 73 years old, a retired electrical engineer who lives in Fairport, N.Y., outside Rochester. “I tell people you can’t be the first on a mountain anymore..

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