In the outer Solar System, well beyond the orbit of Neptune and PlutoPluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most-massive known object to directly orbit the Sun.https://en.wikipedia.org › wiki › Pluto
Mercury: The Forgotten Planet.
The planet Saturn is probably the best known and most beautiful planet in the Solar System. Saturn's rings are far more extensive and more easily seen than those of any other planet. Saturn is the second largest planet in the solar system with a diameter of 120,000 km.
There are different categories of "planet" such as a major planet (Earth/Jupiter), dwarf planet (Pluto/Ceres), and minor planet (asteroids/comets). So, technically speaking, there are plenty of undiscovered planets out there since there are still loads of undiscovered asteroids and comets.
A group of astronomers, including Avi Loeb at Harvard University, suggested Planet Nine may be a tiny black hole somewhere out in the Oort Cloud. If Planet Nine turns out to be Black Hole Nine instead, it's probably about the size of a grapefruit but about 5 to 10 times the mass of Earth.
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.
As an ice giant, Uranus doesn't have a true surface. The planet is mostly swirling fluids. While a spacecraft would have nowhere to land on Uranus, it wouldn't be able to fly through its atmosphere unscathed either. The extreme pressures and temperatures would destroy a metal spacecraft.
Named GJ 504b, the planet is made of pink gas. It's similar to Jupiter, a giant gas planet in our own solar system. But GJ 504b is four times more massive. At 460°F, it's the temperature of a hot oven, and it's the planet's intense heat that causes it to glow.
There's no process inside Uranus, like volcanism on Earth, that would give life inside the planet a form of energy. Life on Uranus would have to be vastly different from anything we have here on Earth to be able to survive.
The International Astronomical Union (IAU) downgraded the status of Pluto to that of a dwarf planet because it did not meet the three criteria the IAU uses to define a full-sized planet. Essentially Pluto meets all the criteria except one—it “has not cleared its neighboring region of other objects.”
Astronomers searching for our solar system's elusive Planet Nine — a theoretical world that may lurk deep in a cloud of icy rocks far beyond the orbit of Neptune — have come up short once again.
At the current rate of solar brightening—just over 1% every 100 million years—Earth would suffer this "runaway greenhouse" in 600 million to 700 million years. Earth will suffer some preliminary effects leading up to that, too.
Additionally, Titan's rivers, lakes and seas of liquid methane and ethane might serve as a habitable environment on the moon's surface, though any life there would likely be very different from Earth's life.
Potential for Life
The surface of Pluto is extremely cold, so it seems unlikely that life could exist there. At such cold temperatures, water, which is vital for life as we know it, is essentially rock-like. Pluto's interior is warmer, however, and some think there could even be an ocean deep inside.
“Pluto is shown in a rainbow of colors that distinguish the different regions on the planet. The left side of the planet is mostly blue-green with purple swirls, while the right side ranges from a vibrant yellow-green at the top to a reddish orange toward the bottom,” Nasa posted.
The diamond rain phenomenon is believed by some scientists to take place on Uranus and Neptune in our solar system. It is thought it exists some 8,000 km below the surface of our ice giant neighbours, created from commonly found mixtures of hydrogen and carbon, squeezed together at incredible pressure.
The Purple Earth hypothesis is an astrobiological hypothesis that photosynthetic life forms of early Earth were based on the simpler molecule retinal rather than the more complex chlorophyll, making Earth appear purple rather than green.
Saturn's atmosphere is very thick and its pressure increases the deeper you go. After a while, you would stop sinking and unfortunately be crushed by the high pressure deeper in Saturn's atmosphere.
The blue-green color results from the absorption of red light by methane gas in Uranus' deep, cold and remarkably clear atmosphere.
The only spacecraft to visit Pluto is NASA's New Horizons, which passed close by in July 2015.
Astronomers have detected a "planet killer" asteroid which crosses Earth's orbit and could slowly move closer and closer to us centuries from now.
A huge “monster” planet that's far too big for its sun could lead scientists to rethink their theories of astronomy. The planet, known as NGTS-1b, is the size of Jupiter. But it orbits around a red dwarf star that's only half the size of our sun.
Consequently, HD 149026b might be the blackest known planet in the Universe, in addition to the hottest. The temperature of this dark and balmy planet was taken with NASA's Spitzer Space Telescope. While the planet reflects no visible light, its heat causes it to radiate a little visible and a lot of infrared light.
At least five major ice ages have occurred throughout Earth's history: the earliest was over 2 billion years ago, and the most recent one began approximately 3 million years ago and continues today (yes, we live in an ice age!).