The light of galaxies greater than 14.7 billion light years away will never reach us because those parts of the universe are receding away from us faster than the light speed.
The common spiral depiction of the Milky Way Galaxy used in media is actually another galaxy: Messier 74. Because we dwell within the Milky Way Galaxy, it is not yet possible for us to take a picture of its spiral structure from the outside.
Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it is possible that these pitch-black lonely planets can support life.
The edge of the observable universe is ~46 billion light years away despite the universe being only ~13.8 billion years old.
Uranium-238 has a half-life of 4.468 billion years or about 1/3 the estimated age of the universe.
White dwarf stars will eventually stop emitting light and become black dwarfs. There aren't any old enough in the universe for this to have happened yet and it's estimated that it could take about a quadrillion years.
Approximation of Pi to 39 decimals is accurate enough to calculate the volume of the known universe with a precision of one atom.
The average color of the universe is a beige-ish white and therefore the color is named "Cosmic Latte".
The loudest events in the universe are starquakes. The largest ever recorded was in 2004, the star Magnetar SGR 1806-20 adjusted itself with the force equal to 22.7 on the Richter scale. It happened 50,000 light years away from Earth, but if it would have been 10 light years away, it would have caused a mass extinction of all animal and plant species on earth.
There is a theory that our universe has collided with other universes in the past and we can view its scars by studying the night sky.
Plasma is actually the most common phase of matter in the universe. Despite being rare on Earth. The Sun, the stars, and the most interstellar matter is plasma.
Only about 0.0000000000000000000042% of the universe contains any matter. The universe is a pretty empty place.
Graham’s number is a number so large that the observable universe is far too small to contain an ordinary digital representation of Graham’s number, assuming that each digit occupies one Planck volume (smallest meaningful measurement).
Mira, a dying star zipping through our universe is shedding its matter, each bit of which may one day grow into a new, individual star of its own. NASA has called it “The Johnny Appleseed of The Universe.”
Some scientists theorize that space and time started as one dimension each (basically a straight line). As it cooled, the universe warped into the 2nd-4th dimensions. Some think that the Universe will eventually be promoted again, to a five-dimensional state.
There is a theory proposed by many physicists that our universe may exist inside a black hole and that every black hole in our Universe may contain a totally new Universe.
The largest galaxy in the observable universe is an elliptical galaxy, IC 1101. It has 100 trillion stars and is 6 million light years across. By comparison, the Milky Way has a mere 100 billion stars and is 120,000 light years across.
The oldest and therefore furthest known galaxy we have discovered is over 13.7 billion light years away. It's called z8_GND_5296. The light has taken so long to reach us that the star which collapsed to form the gas that Sun is made out of wasn't "born" yet. Galaxies this far away from help astronomers understand the very early universe and how it has evolved over time. Due to the expansion of space, the distant galaxy pictured here technically wouldn't be there anymore and would actually be “currently 13.1 Giga light-years away from us. or 4.0×109 pc".
Galileo was placed under house arrest by The Holy Office until his death in 1642 for defending his views about the Earth not being the center of the universe. The Vatican formally acknowledged they were wrong and Galileo was right in 1992.
The fastest spinning Neutron stars known to man, rotate at 716 complete rotations per second.
The sun is brighter than about 90% of the stars in the Milky Way Galaxy.
Even though the Big Bang happened 13.7 billion years ago, and no object can move faster than the speed of light, the diameter of the known universe is at least 46 billion light years. It is because the expansion of the universe itself can occur faster than the speed of light. Particles cannot travel faster than the speed of light since if a particle has mass then it takes an infinite amount of energy to pass the speed of light. Space-time has no such limitation.
It is theorized that there may hypothetical objects that behave just the opposite of a black hole called a white hole. They cannot be entered from the outside, but matter and light can escape. The Big Bang might have been a white hole itself, and big bangs possibly occur at the center of all black holes.
If you watched an object slip into a black hole, no matter how long you watched, you would never actually see the object enter it due to time dilation.
There is a large area of space that is devoid of any galaxies that have been theorized by cosmologist Laura Mersini-Houghton, to be the imprint of a parallel universe.
In 2008, a gamma-ray burst was observed. It was a violent cosmic explosion, 7.5 billion light-years away, which is halfway across the visible universe, which could have been seen with a naked eye from the surface of the Earth. Anyone who saw it was looking billions of years into the past with their eyes.
A region near a black hole is called a photon sphere where the gravitational pull is so strong that light photons orbit it, meaning if you were at that point and turned to the side, you could see the back of your own head.
Theoretically, if astronauts traveled in a spaceship at a constant 1 g of acceleration, they could travel the entire universe in their own lifetime, while billions of years would have passed by on earth.
The coldest temperature ever recorded in the known universe was in Massachusetts, MIT, where scientists attained temperatures 810 trillionths of a degree Fahrenheit above the absolute zero (-459.67°F).
On May 20, 1964, two astronomers named Arno Penzias and Robert Wilson working at a New Jersey laboratory turned a giant microwave antenna toward what they thought would be a quiet part of the Milky Way. When they heard static, they thought they were hearing interference from pigeon poop on their antennae. They were actually hearing microwave background remains of the beginnings of the universe.
The largest known black hole (Holmberg 15A) has a diameter of 1 trillion km, more than 190 times the distance from the Sun to Pluto.
The Oh-My-God particle was an ultra-high-energy cosmic ray that was detected on 15 October 1991 by the University of Utah. It was traveling so absurdly fast that time dilation dictates that it would have experienced only 16 days of time since the beginning of the universe.
There is a “one-electron universe” hypothesis which proposes that there exists a single electron in the universe, that propagates through space and time in such a way that it appears in many places simultaneously.
According to Article VIII of the Outer Space Treaty of 1967, you can be arrested for a crime committed anywhere in the known universe.
Over time a white dwarf will cool into a black dwarf. Given the length of time it takes for this to happen (10s-100s of billion years) and because our Universe’ age (13.8 billion years old), none are expected to exist yet.
The coldest known natural place in the Universe is the Boomerang Nebula. At −272.15°C it is 1°C warmer than absolute zero, and 2°C colder than background radiation from the Big Bang.
According to the string theory, black holes have the potential to be shaped like rings, helices, or even like the planet Saturn, but no one actually knows their true shape.
The Pillars of Creation, a nebula 7,000 light years away, was destroyed by supernova 6,000 years ago. In a thousand years, we will see it destroyed as it takes 7,000 years for the light to reach Earth.
Hubble has captured a set of galaxies that have such a strong gravitational pull that they warp time and light, an effect known as gravitational lensing and this specific set of galaxies creates the appearance of a smiley face.
A neutron star is so dense that if an object was dropped from one meter above the star’s surface, it would hit the surface at a speed of 7.2 million km per hour.
If you could fold a piece of paper in half 103 times, it would be as thick as the observable universe.
The SN 1006 supernova was the brightest star event in recorded human history. It was widely seen on Earth beginning in the year 1006. Some historical sources state that it was bright enough to cast shadows.