2 天之前 · Brown notes that the putative ninth planet—at 5,000 times the mass of Pluto—is sufficiently large that there should be no debate about whether it is a true planet. Unlike the class of smaller objects now known as dwarf planets, Planet Nine gravitationally dominates its neighborhood of the solar system.

2023年10月5日 · A pair of theoretical physicists are reporting that the same observations inspiring the hunt for a ninth planet might instead be evidence within the solar system of a modified law of gravity ...

2023年10月16日 · Evidence pointing toward the existence of an undiscovered ninth planet in the solar system may actually indicate our ideas of gravity are incorrect.

2016年1月20日 · Caltech astronomers believe they've found evidence for a ninth planet in our solar system, a giant with a 20,000 year orbit. An artist's concept of the possible ninth planet, dubbed Planet Nine, which is believed to exist because of the pull it exerts on the outer objects in our solar system.

2 天之前 · Some call the potential celestial object Planet X and some call it Planet 9 — as in, the ninth planet in our solar system now that Pluto has been demoted to a dwarf planet. But by any name, the interest is clearly high.

Since writing the first draft of this answer, I've found out that Batygin has made some estimates that this planet would have been ejected long before the Late Heavy Bombardment - thought to be the result of a Jumping Jupiter scenario - occurred, meaning that it could not be that ejected ice giant, unless we accept a different cause of the LHB.

2024年4月30日 · More evidence for a hypothetical extra planet lurking in the most distant reaches of our solar system has come to light — and the clues are associated with icy bodies that cross the orbit of...

2024年5月27日 · Gravitation Notes for Class 9 Science are here. You can download the Gravitation Notes PDF to study all the topics in this chapter. Moreover the class 9 Science notes include chapter summary, definitions, examples, and key pointers for Gravitation.

NCERT Solutions Class 9 Science Chapter 10 Gravitation – Here are all the NCERT solutions for Class 9 Science Chapter 10. This solution contains questions, answers, images, step by step explanations of the complete Chapter 10 titled Gravitation of Science taught in class 9.

2023年6月10日 · NCERT Solutions for Class 9 Science Chapter 9 Gravitation provides detailed answers for all in-text and exercise Questions. These solutions contain an in-depth explanation of each topic involved in the chapter. Students studying in class 9 can access these solutions for free in PDF format.