Infinity-Science

There is sound in space. Sound is a pressure wave, and as long as there is some kind of gaseous medium, there is the possibility of forming pressure waves in it. In space, the interplanetary medium is a very dilute gas at a density of about 10 atoms per cubic centimeter, and the speed of sound in this medium is about 300 kilometers per second. Typical disturbances due to solar storms and "magneto-sonic turbulence" at the Earth's magnetopause have scales of hundreds of kilometers, so the acoustic wavelengths are enormous. Human ears would never hear them, but we can technologically detect these pressure changes and play them back for our ears to hear by electronically compressing them. @LAQMC

Einstein's theory of general relativity shows that gravity not only pulls on matter, but also space and even ‘Time' itself. @LAQMC

8000 stars are visible with naked eye from Earth. 4000 in each hemisphere, 2000 at daylight and 2000 at night. @LAQMC

The Antikythera mechanism was the first type of analogue computer that was used to calculate the position of the Sun, Moon and planets at given times. It was found off a shipwreck and was believed to have been built in around 150 BC. Similar types of orreries were not made until the year 1400. @LAQMC

The existence of Jupiter's magnetic field was first inferred from observations of radio emissions at the end of the 1950s and was directly observed by the Pioneer 10 spacecraft in 1973. @LAQMC

While astronomers used to believe that galaxies were distributed more or less evenly through space, they have now found regions where galaxies are rare or absent. The largest of these regions is located in the direction of the constellation Bootes, and measures more than 300 million light years across. @LAQMC

At the core of radio galaxy Centaurus A is a super massive black hole, hundreds of millions of times the mass of the Sun. From above and below this violent gravity well, jets of matter shoot out at near light speed in two huge plumes. Each plume is over a million light years long, 10 Milky Way galaxies would fit along each plume‘s length @LAQMC

Elliptical galaxies are shaped as their name suggests. They are generally round but stretch longer along one axis than along the other. They may be nearly circular or so elongated that they take on a cigar-like appearance. @LAQMC

You could fit 755 Earths into Saturn's volume, but Saturn only has the mass of 95 Earths. The ringed giant is less dense than water @LAQMC

Astronauts brought back about 800 pounds of lunar rock to Earth. Most of it has not been analyzed. @LAQMC

The Milky Way galaxy has a mass of 750 B to 1 T solar masses with 200-400 B stars and is 12 B yrs old. @LAQMC

Neutron stars are so dense, that a soup can full of neutron star material would have more mass than the Moon. @LAQMC

The first asteroid was discovered by Giuseppe Piazzi in 1801. The asteroid was first named Ceres Ferdinandea but later was changed to just Ceres. Giuseppe Piazzi had named the asteroid partly after King Ferdinand IV. @LAQMC

The difference between asteroids and comets is that asteroids are rocks that primarily circle the Sun between the orbits of Mars and Jupiter while comets on the other hand tend to have highly elliptical orbits taking them from the frozen extreme edges of our Solar System to within distances so close to the Sun that solar radiation causes material in the comet to vaporize and stream out, forming the characteristic comet's tails. @LAQMC

A dwarf star is so dense that it would take 8 men to lift a teaspoon full of its matter. @LAQMC

Over 100 artificial satellites are now launched into space every year, a few of which are space telescopes. @LAQMC

The lunula is the half-moon shaped pale area at the bottom of finger nails. @LAQMC

Kurzgesagt – In a Nutshell: Wormholes Explained – Breaking Spacetime