Astronomy

A day on Mercury lasts for 2 years

A day on Mercury is twice as long as a year on Mercury.
Mercury rotates slowly, but it has a fast orbit speed, nearly 50 kilometers (30 miles) per second. A year on Mercury (the time it takes to orbit the sun) is equivalent to 88 Earth-days. It takes Mercury 59 Earth-days to spin around once on its axis. Because Mercury completes three rotations for every two orbits around the sun, a full day (the time it takes for the sun to return to the same point in the sky) is almost 176 Earth-days. That makes its day twice as long as its year.

Mercury is the closest planet to the sun and the second smallest. It is the fastest-moving planet, so it was named after the Roman god of speed.
It’s because Mercury is so close to the sun, why the orbital speed is so high.

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The biggest diamond is 10 billion trillion trillion carat

The newly discovered cosmic diamond is a chunk of crystallized carbon 50light-years from the Earth in the constellation Centaurus. (A light-year isthe distance light travels in a year, or about 6 trillion miles.) It is2,500 miles across and weighs 5 million trillion trillion pounds, whichtranslates to approximately 10 billion trillion trillion carats, or a onefollowed by 34 zeros.

“It’s the mother of all diamonds!” says Metcalfe. “Some people refer to itas ‘Lucy’ in a tribute to the Beatles song ‘Lucy In The Sky With Diamonds.’”

The diamond star completely outclasses the largest diamond on Earth, the530-carat Star of Africa which resides in the Crown Jewels of England. TheStar of Africa was cut from the largest diamond ever found on Earth, a3,100-carat gem.

The huge cosmic gem (technically known as BPM 37093) is actually acrystallized white dwarf. A white dwarf is the hot core of a star, left overafter the star uses up its nuclear fuel and dies. It is made mostly ofcarbon and is coated by a thin layer of hydrogen and helium gases.

Source: CfA

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The most distant object ever observed is over 13 billion lightyears away

The galaxy UDFy-38135539, also known as HUDF.YD3, is the most distant object ever observed and the most distant astronomical object known so far. The galaxy is located more than 4 billion parsecs from Earth. 1 parsec is 3.26 lightyears so this galaxy is over 13 billion lightyears away.

Sources: Nature, Wikipedia,