2024年11月6日 · In January 2016, California Institute of Technology (Caltech) astronomers Konstantin Batygin and Mike Brown announced research that provided evidence for a planet about 1.5 times the size of Earth in the outer solar system. The existence of this distant world remains theoretical at this point. Batygin and Brown did not actually observe a planet.

2024年4月2日 · Since the early 1900s, astronomers have been searching for a planet that could be responsible for perturbations in the orbits of other objects in the outer Solar System. In the early years of the search, the mystery world was known as Planet X. In the new millennium, the hunt for a ninth planet was renewed, this time under the name Planet Nine.

2024年11月6日 · Astrophysicists don’t know if there are undiscovered planets in our solar system, but new technologies are enabling researchers to get closer to an answer. What Is Planet X? Ancient people and early astronomers long knew about five planets: Jupiter, Mars, Mercury, Saturn, and Venus, though these planets seemed like stars at first.

2014年3月8日 · A NASA spacecraft has pounded another nail into the coffin of the hypothetical solar system body known as "Planet X" or "Nemesis."

2025年1月13日 · The search for Planet X, a mysterious planet beyond Neptune, is intensifying thanks to a groundbreaking new telescope set to launch in 2025. This elusive planet, also known as Planet...

2015年1月20日 · Caltech researchers have found mathematical evidence suggesting there may be a "Planet X" deep in the solar system. This hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto.

2024年2月19日 · A study recently submitted to The Astronomical Journal continues to search for the elusive Planet Nine (also called Planet X), which is a hypothetical planet that potentially orbits in the...

2024年2月28日 · In a new study, the researchers — who have been looking for the planet for almost a decade — said they believe they could find the elusive world in the next few years. Planet Nine, also known...

2024年12月6日 · There might be a large, unknown planet lurking in the outer Solar System far beyond Pluto - and astronomers have more evidence to support it.

4 天之前 · Shaped like a megaphone, the upcoming mission will map the entire sky in infrared light to answer big questions about the universe. Expected to launch no earlier than Thursday, Feb. 27, from Vandenberg Space Force Base in California, NASA’s SPHEREx space observatory will provide astronomers with a big-picture view of the cosmos like none before.