Another planet or Another Dimension that, by the time we get to see it, has been left in ruins for a long, long time. There are signs here and there that this world once boasted a civilization, maybe even a great civilization, but all that's left now are a few decaying remnants.
Mercury is a dead planet and the most heavily cratered object in the solar system. It is a world of black starry skies, gray craters, no moon and not enough gravity to hold an atmosphere. Without an atmosphere, Mercury is a silent world without any sound.
Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth.
This hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto. The object, which the researchers have nicknamed "Planet Nine," could have a mass about 10 times that of Earth and orbit about 20 times farther from the Sun on average than Neptune.
Planet Nine is unnamed, unconfirmed, and unknown. We haven't been able to detect it, and we don't even know for sure that if we did spot it, it would even be a planet. It might be a special kind of black hole, or be made entirely of dark matter.
Astronomers believe that supermassive black holes lie at the center of virtually all large galaxies, even our own Milky Way. Astronomers can detect them by watching for their effects on nearby stars and gas.
Although the odds of Earth getting swallowed by a black hole, or any Solar System planet, for that matter, are low, it's definitely a real possibility.
Because Eris appeared to be larger than Pluto, NASA initially described it as the Solar System's tenth planet.
What might Planet Nine look like? Assuming this planet-like object really does exist out there, Planet Nine's mass would most likely be a magnitude (roughly 10 times) greater than Earth's, with a girth approaching the range of one of our ice giants.
The mystery object has been dubbed Planet 9. Observations have yet to discover the source of this gravity from the usual optical, microwave, infrared or electromagnetic wave spectrums, leading to speculation that it could be a rogue planet core, a small black hole, or even a cluster of dark matter.
0.015% 0.007% 3.5% 64% Page 2 Venus is the most dangerous planet in the solar system: its surface is at 393°C, hot enough to melt lead. It's even hotter than the planet Mercury, which is closest to the Sun. Venus' atmosphere is acidic and thick.
Located about 40 light-years from Earth, GJ 1214 b is a super-Earth nearly three times our own planet's diameter and seven times Earth's mass. Orbiting its red dwarf star once every 38 hours, this strange planet sports an estimated temperature of about 450° Fahrenheit (230° Celsius).
The planets move around in our sky and become brighter and dimmer over time depending on where they are in their orbits around the sun. Uranus, Neptune and Pluto are never visible to the naked eye.
Phobetor, Draugr and Poltergeist
Some 2,300 light years from Earth lies the pulsar PSR B1257+12. It flashes 161 times per second and has been nicknamed “Lich” after an undead creature in western folklore. It is orbited by three rocky, terrestrial planets named Phobetor, Draugr and Poltergeist.
These doomed worlds were among the first and creepiest to be discovered as they orbit an undead star known as a pulsar. Pulsar planets like Poltergeist and its neighboring worlds, Phobetor and Draugr, are consumed with constant radiation from the star's core.
The Greeks named the fourth planet 'Mars' as the 'bloody planet' or a 'red planet' because this planet shines in sky with red colour resembling blood. Mars is a hot, dry, fiery and violent planet. Mars was a Roman war god and the symbol formed of this planet was also a warrior with shield and spear in his hand.
The strength of an object's gravitational pull is proportional to how much mass it has. Because the sun is losing mass, its pull on Earth is weakening, leading our planet to drift away from our star by about 2.36 inches (6 centimeters) per year, DiGiorgio said.
This hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto. The object, which the researchers have nicknamed "Planet Nine," could have a mass about 10 times that of Earth."
Earth is the only planet in the universe known to possess life. The planet boasts several million described species, living in habitats ranging from the bottom of the deepest ocean to a few miles up into the atmosphere. Researchers think far more species remain that have yet to be described to science.
Astronomers have announced the discovery of the 100th planet known to inhabit another solar system. The star is 100 light years from Earth in the southern constellation Grus, or The Crane. The planet, one and a half times the mass of Jupiter, has a roughly circular orbit, like those of the sun's family of planets.
Neptune is dark, cold, and very windy. It's the last of the planets in our solar system.
Psyche was discovered by Italian astronomer Annibale de Gasparis on March 17, 1852. He named the asteroid for Psyche, the Greek goddess of the soul who was born mortal and married Eros (Roman Cupid), the god of Love.
Is it possible for a black hole to "eat" an entire galaxy? No. There is no way a black hole would eat an entire galaxy. The gravitational reach of supermassive black holes contained in the middle of galaxies is large, but not nearly large enough for eating the whole galaxy.
We are in absolutely no danger from black holes. They're a bit like tigers – it's a bad idea to stick your head in their mouth, but you're probably not going to meet one on your way to the shops. Unlike tigers, black holes don't hunt. They're not roaming around space eating stars and planets.
Ripped apart: The Earth would stand no chance if it encountered a rogue black hole; the cosmic black hole's tidal forces would easily rip the planet apart. Lost in space: Matter piles up in a superheated, rapidly spinning disc before plunging through the horizon of a black hole, never to reappear again.