Helium was discovered in the Sun 27 years before it was found on Earth

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MIT scientists finally reveal why ancient Roman concrete still stands after 2,000 years

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Florida's Burmese python challenge can't wipe out invasive snakes from the Everglades. Awareness is the real victory, officials say

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NASA's Hubble spots two enormous galaxy clusters merging billions of light-years away

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A comet from another star system flew through our Solar System and scientists checked it for alien signals

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Quote of the day by Isaac Newton: "Truth is ever to be found in simplicity, and not in…"

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NASA launches high-stakes mission to save ageing telescope Swift from falling to Earth

The mission will be carried out by US startup Katalyst Space Technologies, which won the NASA contract last September. Its three-armed robotic spacecraft, named Lift, will launch aboard an air-launched Pegasus rocket from the Marshall Islands before spending about a month chasing down Swift in orbit. Swift has been observing the universe since 2004.

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