Infinity-Science

The reason Venus is so bright is because the clouds are so dense that light bounces off them, making Venus appear bright to us on Earth. @LAQMC

The neutron star at the centre of supernova remnant Cassiopeia A has a gravity 100 billion times stronger than Earth‘s, with an atmosphere 4 inches high @LAQMC

Supernovae are twice as common in Andromeda galaxy than in Milky way galaxy. @LAQMC

The first stars in the Universe formed about 400 million years after the Big Bang. @LAQMC

When 3 celestial bodies align, like in an eclipse, it's called a "syzygy" @LAQMC

Saturn's second largest moon, Rhea, is icy. According to the results from the NASA's Cassini spacecraft the oxygen appears to arise when Saturn's magnetic field rotates over Rhea. However, oxygen at Rhea's surface is estimated to be about 5 trillion times less dense than what we have at Earth. @LAQMC

The philosopher Immanuel Kant (1724–1804) was the first person to propose that what we now call galaxies lay outside the Milky Way and were indeed galaxies (or "island universes", as Kant called them) in their own right. @LAQMC

The Sun is 99.86 % of all the mass in our solar system. The Earth, the other planets, moons, asteroids, comets etc account for just 0.14 % @LAQMC

The most extensive linear dune systems in the solar system are on Saturn's moon Titan @LAQMC

The unstable and unpredictable giant star Eta Carinae shines 4 million times brighter than the Sun, and weighs in at 100 solar masses. All the talk is usually of red giant star Betelgeuse going supernova, but this monster is also just as likely to blow. "Likely" means anytime now, or the next few thousand years @LAQMC

Under the new definition, a planet has to be large enough that its gravity forces it into the shape of a sphere (smaller, oddly-shaped asteroids therefore do not quality); it has to be orbiting a star, and not a satellite of another planet (several moons in the Solar System are bigger than Pluto); it has to be not massive enough to cause thermonuclear fusion (in which case it would classify as a star); and it must have cleared its neighbouring region of planetesimals and other objects by its gravitational pull. @LAQMC

Wolf-Rayet stars are highly luminous, from tens of thousands to several million times the bolometric luminosity of the Sun, although not exceptionally bright visually since most of their output is in far ultraviolet and even soft X-rays. @LAQMC

The exoplanet Gliese 581g is currently one of the best candidate to host life beyond our own solar system. This rocky world is about 20 light-years away from our solar system and it's probably two to three times as massive as Earth and it is estimated that it zips around its parent star, the red dwarf Gliese 581, every 30 days. @LAQMC

If Neptune's moon Triton was orbiting the Sun and not Neptune, it would be considered a dwarf planet @LAQMC

Laika the dog was the first living thing which was sent to space. @LAQMC

Pluto is smaller than our own Moon, yet has (at least) four moons of its own. @LAQMC