In 2006 the International Astronomical Union (IAU) demoted the much-loved PlutoLike other Kuiper belt objects, Pluto is made primarily of ice and rock and is much smaller than the inner planets. Compared to Earth's moon, Pluto has only one sixth its mass and one third its volume.https://en.wikipedia.org › wiki › Pluto
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.
In the outer Solar System, well beyond the orbit of Neptune and Pluto, a ninth planet may be waiting to be discovered. This 'ghost planet', nicknamed Planet 9 or Planet X, has never been observed directly, but peculiar goings-on in the space beyond Neptune hint tantalisingly at its existence.
Mercury: The Forgotten Planet.
The ability of these past sky surveys to detect Planet Nine was dependent on its location and characteristics. Further surveys of the remaining regions are ongoing using NEOWISE and the 8-meter Subaru Telescope. Unless Planet Nine is observed, its existence remains purely conjectural.
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.
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.
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.”
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.
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.
Four Of Our Planets Are Missing.
Venus is sometimes called Earth's twin because Venus and Earth are almost the same size, have about the same mass (they weigh about the same), and have a very similar composition (are made of the same material). They are also neighboring planets. However, Venus and Earth are also very different.
Venus is the second planet from the Sun and is Earth's closest planetary neighbor. It's one of the four inner, terrestrial (or rocky) planets, and it's often called Earth's twin because it's similar in size and density.
Early in Earth's life, over 4 billion years ago – our planet had a twin called Theia. Theia gave Earth the chance to harbour life. About the size of Mars, Theia was on a similar orbit to Earth.
The planets of the solar system are varied in their appearance. Mercury is slate gray while Venus is pearly white, Earth a vibrant blue, and Mars a dusky red. Even the gas giants are different, Neptune and Uranus an opaque blue, while Jupiter and Saturn are mostly beige with brilliant red-brown belts.
It is incredibly unlikely that Earth would ever fall into a black hole. This is because, at a distance, their gravitational pull is no more compelling than a star of the same mass.
Essentially, Pluto had residual heat from when it was closer to the sun. However, the inertia starting to wear off and, as Pluto gets colder, more and more of its atmosphere will freeze back onto its surface and "disappear."
According to a recent study in The Astrophysical Journal, Jupiter probably kicked a ninth planet out of our solar system back in the day.
Pluto was removed from the planet list in 2006 as it did not fulfill the requirements to be a planet as per the definition of the word by the International Astronomical Union (IAU). IAU had categorised the solar system bodies into three categories -- planets, dwarf planets, and small solar system bodies.
Researchers from Harvard University have published a paper that explores the possibility that our solar system is home to a tiny, ancient black hole. For decades, the solar system had nine official planets, but Pluto was kicked out of the planet club and demoted to dwarf planet status.
Saturn's environment is not conducive to life as we know it. The temperatures, pressures, and materials that characterize this planet are most likely too extreme and volatile for organisms to adapt to.
Planet nine might be a primordial black hole
The closest confirmed black hole to Earth lies in a triple-star system called HR 6819, roughly 1,000 light-years away. It's about four times the mass of the sun — comparatively light in the scope of the universe.