Question

Only one thing which is rare in the universe? Wrong answer will be reported​

Answer 1

Answer:

An image of the Large Magellanic Cloud taken with a ground-based telescope. The inset image was captured by the Hubble Space Telescope, and shows a galaxy cluster teeming with variable Cepheids, a class of stars that flicker regularly. Using this pulsation rate, scientists have calculated the universe's expansion rate, but that number doesn't match with values derived from other cosmic phenomena, such as the echo of the Big Bang known as the cosmic microwave background radiation. (Image credit: An image of the Large Magellanic Cloud taken with a ground-based telescope. The inset image was captured by the Hubble Space Telescope, and shows a galaxy cluster teeming with variable Cepheids, a class of stars that flicker regularly. Using this pulsation rate, scientists have calculated the universe's expansion rate, but that number doesn't match with values derived from other cosmic phenomena, such as the echo of the Big Bang known as the cosmic microwave background radiation.)

There's a puzzling mystery going on in the universe. Measurements of the rate of cosmic expansion using different methods keep turning up disagreeing results. The situation has been called a "crisis."

The problem centers on what's known as the Hubble constant. Named for American astronomer Edwin Hubble, this unit describes how fast the universe is expanding at different distances from Earth. Using data from the European Space Agency's (ESA) Planck satellite,

Answer 2

• "At" stands for astatine. It is an element with 85 protons packed into its nucleus, thus the atomic number "85" .The problem is, there's something about 85 protons in a tight space that nature doesn't enjoy. Almost as soon as they squeeze together bits of nuclear material get spat out, or get added, and poof! It isn't astatine any longer.
• In 1931, an Alabama physicist said, "I've done it!" and he called his discovery "alabamine" (discoverers get naming rights), but his work was invalidated. A chemist in Dacca (now Bangladesh, then India) said "I've got it!" and named his version "dakkin", but his method proved faulty. A Swiss chemist came next and called his discovery "helvetium" from Helvetia, (Latin for Switzerland), but nobody could reproduce what he'd done, until finally three Berkeley scientists did it right, and so it became Astatine.