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space is a near-perfect vacuum,has no air for sound waves even the most violent supernova explosion would occur in absolute silence.Saturn is so low density that it is actually less dense then water.If you had a bathtub large enough, the planet would float.

he Sun is unimaginably massive. It contains 99.8% of all the mass in our solar system. You could fit roughly 1.3 million Earths inside it.

Neutron stars are incredibly dense. A single sugar-cube-sized amount of neutron star material would weigh about one billion tons on Earth.

The age of the universe is approximately 13.79 a sugar-cubed-sized neutron star would weigh about a billion tons on earth.

Footprints on the Moon could last for millions of years. Since the Moon has no atmosphere, there is no wind or water to erode the prints left by Apollo astronauts.

Most of the universe is invisible. Only about 5% of the universe is made of "normal" matter (stars, planets, and us); the rest is mysterious dark matter and dark energy.

Space has a distinct smell. Astronauts have described the smell of space—often noticed on their suits after a spacewalk—as similar to seared steak, hot metal, or welding fumes.

All the planets could fit between Earth and the Moon. If you lined up every planet in our solar system pole-to-pole, they would just barely fit in the gap between us and our moon, with a few thousand miles to spare.

The Sun's "scream" would be deafening. If sound could travel through the vacuum of space, the Sun's constant nuclear reactions would create a roar of about 100 decibels on Earth—roughly the volume of standing next to a loud lawnmower or a chainsaw all day.

There is a "Bermuda Triangle" in space. Known as the South Atlantic Anomaly, this is a region where Earth's inner radiation belt comes closest to the surface. It causes computers on the International Space Station to glitch and makes astronauts see strange "flashes" in their eyes.

Uranus rotates on its side. Unlike any other planet, Uranus is tilted at roughly 98 degrees, meaning it effectively "rolls" around the Sun like a bowling ball. Scientists believe a massive collision in its early history knocked it over.

Galaxies can "eat" each other. Through a process called galactic cannibalism, larger galaxies use their gravity to pull in and merge with smaller neighbors. Our own Milky Way is currently "digesting" several smaller satellite galaxies.

A day on Mercury is longer than its year. Mercury orbits the Sun extremely quickly (88 Earth days), but it rotates on its axis so slowly that one full day-night cycle takes 176 Earth days.

The "Diamond Star" is real. Astronomers discovered a white dwarf star named BPM 37093 (nicknamed "Lucy") that has a core of crystallized carbon—essentially a 10-billion-trillion-trillion-carat diamond the size of the Moon.

Spacecraft are currently reaching "Interstellar Space." NASA’s Voyager 1 and Voyager 2 are the only human-made objects to ever leave the heliosphere (the bubble of protection created by our Sun) and enter the space between stars.

Metal can fuse together instantly. In the vacuum of space, if two clean pieces of the same metal touch, they will permanently bond in a process called cold welding. This happens because there is no air or moisture to form a protective oxide layer, so the atoms "think" they belong to the same piece.

It rains diamonds on other planets. On gas giants like Neptune and Uranus, the extreme pressure and heat are so intense they can crush carbon atoms into solid diamonds. These diamonds then "rain" down toward the planets' cores.

There is a "Great Nothing" in the universe. The Bootes Void is a massive, roughly spherical region of space about 330 million light-years in diameter that is almost entirely empty. While a region that size should contain about 2,000 galaxies, we have only found about 60 inside it.

Stars outnumber sand. There are more stars in the observable universe than there are grains of sand on all the beaches on Earth. Astronomers estimate there are roughly 10,000 stars for every single grain of sand.

Space smells like "seared steak." Astronauts returning from spacewalks often report a distinct odor clinging to their suits, described as a mix of hot metal, fumes, and burnt meat.

Rogue planets wander in total darkness. Not all planets orbit a star. There are billions of rogue planets drifting alone through the Milky Way, having been kicked out of their original solar systems.

The largest known structure is "impossible." The Hercules-Corona Borealis Great Wall is a massive filament of galaxies that stretches roughly 10 to 15 billion light-years across. This is so large that it challenges the "cosmological principle," which assumes the universe should be uniform on such a massive scale.

We are living on a "Luminous Island." Everything we can see—stars, planets, and galaxies—makes up only about 5% of the universe. The other 95% consists of dark matter and dark energy, which are invisible and only detectable by their gravitational effects

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"All about planets"

Name: All about planets
Author: Alfred Imani

Alfred Imani

A fascinating collection of facts about the universe, covering everything from the density of Saturn and neutron stars to the mysterious smells of space and the existence of rogue planets.

(12 pages)

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