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  2. The solar system once had five giant gaseous planets rather than the four it has today. That’s the conclusion from a computer simulation of the solar system’s evolution, which suggests the fifth giant was hurled into interstellar space some 4 billion years ago, after a violent encounter with Jupiter.
    www.newscientist.com/article/dn20952-missing-pla…
    Fomalhaut b is a ghost with a complicated history. In 2004, Paul Kalas, an astronomer at the University of California, Berkeley, made a surprising find. Using NASA's powerful Hubble telescope, Kalas and his colleagues saw direct evidence of a planet moving around the star Fomalhaut, which is about 25 light-years away from Earth.
    www.cnet.com/science/astronomers-solve-myster…
     
  3. Why Is Pluto No Longer a Planet? | Britannica

    Pluto is now classified as a dwarf planet because, while it is large enough to have become spherical, it is not big enough to exert its orbital dominance and clear the neighborhood surrounding its orbit.

     
  4. Mars - Students | Britannica Kids | Homework Help

    It is not known whether Mars’s core is currently solid or liquid. However, ancient, highly magnetized rocks in its southern hemisphere suggest that in the past Mars had a strong magnetic field, which disappeared as the planet cooled.

  5. What Happens to Earth If the Amazon Rainforest Is Completely …

  6. Pluto - Kids | Britannica Kids | Homework Help

    Scientists believed that Pluto was the ninth planet in the solar system. In 2006 the United States launched a spacecraft, called New Horizons, to explore Pluto. The journey to Pluto was expected to take about nine years.

  7. 7 Puzzling Plane Disappearances | Britannica

  8. Neptune | Planet, Moons, Rings, Temperature, Mass, …

    Nov 10, 2024 · Neptune, third most massive planet in the solar system and the eighth and outermost planet from the Sun. Neptune has 14 moons, only two of which were discovered before Voyager 2’s visit in 1989, and a system of rings, …

  9. Mars | Facts, Surface, Moons, Temperature,

    4 days ago · Mars is the fourth planet in the solar system in order of distance from the Sun and the seventh in size and mass. It is a periodically conspicuous reddish object in the night sky. There are intriguing clues that billions of years ago …

  10. Saturn - Students | Britannica Kids | Homework Help

    A day on a planet is defined by its rotation period, so a day on Saturn is about 10.5 Earth hours, or less than half as long as a day on Earth. As with other planets, the force of the rotation causes some bulging at the equator and …

  11. Mass extinction event | Definition & Examples

    Nov 12, 2024 · Ammonoids disappeared from the fossil record at the end of the Cretaceous Period, some 66 million years ago. (more)

  12. End-Triassic extinction | Evidence & Facts | Britannica

    On land a great part of the vertebrate fauna disappeared, although the dinosaurs, pterosaurs, crocodiles, turtles, mammals, and fishes were little affected by the transition.

  13. 9 Ghostly Planets | Britannica

    Author Zecharia Sitchin claimed in The 12th Planet (1976) that ancient Sumerian texts revealed the existence of a planet called Nibiru, which circles the Sun every 3,600 years on a long elliptical orbit like a comet and passes between the …

  14. Permian Extinction, Climate Change, Fossils - Britannica

  15. Major Mass Extinctions | Britannica

  16. Trans-Neptunian Object, Dwarf Planet & Kuiper Belt - Britannica

  17. Dinosaur - Extinction Causes, Evidence, & Theory | Britannica

  18. What Happened to the Dinosaurs? | Britannica

  19. Eris | Dwarf Planet, Kuiper Belt, Plutoid | Britannica

  20. Triton - Evolution, Moon, Neptune | Britannica

  21. 6 Lost Civilizations | Britannica

  22. Malaysia Airlines flight 370 disappearance summary - Britannica