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Eris, the largest known dwarf planet in the solar system, is discovered by the team of Michael E. Brown, Chad Trujillo,

Eris, the largest known dwarf planet in the solar system, is discovered by the team of Michael E. Brown, Chad Trujillo, and David L. Rabinowitz using images originally taken on October 21, 2003, at the Palomar Observatory

Michael E. Brown is an American astronomer, who has been professor of planetary astronomy at the California Institute of Technology (Caltech) since 2003. His team has discovered many trans-Neptunian objects (TNOs), including the dwarf planet Eris, which was originally thought to be bigger than Pluto, triggering a debate on the definition of a planet.

He has been referred to by himself and by others as the man who "killed Pluto", because he furthered Pluto's being downgraded to a dwarf planet in the aftermath of his discovery of Eris and several other probable trans-Neptunian dwarf planets. He is the author of How I Killed Pluto and Why It Had It Coming, published in 2010. He was awarded the Kavli Prize (shared with Jane Luu and David C.

Events Before

  1. After hosting the show for over 30 years, Casey Kasem steps down as host of "American Top 40" and is succeeded by Ryan S

    After hosting the show for over 30 years, Casey Kasem steps down as host of "American Top 40" and is succeeded by Ryan Seacrest

  2. Britney Spears has her surprise marriage annulled less than 55 hours after tying the knot with childhood friend Jason Al

    Britney Spears has her surprise marriage annulled less than 55 hours after tying the knot with childhood friend Jason Alexander at the Little White Wedding Chapel in Las Vegas

  3. Mark Zuckerberg launches Facebook from his Harvard dormitory room

    Mark Zuckerberg launches Facebook from his Harvard dormitory room

  4. American singer-songwriter Solange Knowles (17) weds Texas Southern University football player Daniel Smith (19) at Old

    American singer-songwriter Solange Knowles (17) weds Texas Southern University football player Daniel Smith (19) at Old Bahama Bay Resort in Grand Bahama Island; divorce in 2007

  5. Luciano Pavarotti performs in his final opera, "Tosca," at New York's Metropolitan Opera

    Luciano Pavarotti (12 October 1935 – 6 September 2007) was an Italian operatic tenor who during the late part of his career crossed over into popular music, eventually becoming one of the most...

Events After

  1. Sydney, Australia, swelters through its hottest New Year's Day on record, with the temperature peaking at 45.8 degrees C

    Sydney, Australia, swelters through its hottest New Year's Day on record, with the temperature peaking at 45.8 degrees Celsius, sparking bushfires and power outages

  2. American actor Eddie Murphy (44) divorces Nicole Mitchell after 13 years of marriage

    Edward Regan Murphy is an American comedian, actor, and singer. He had his breakthrough as a stand-up comic before gaining stardom for his film roles; he is widely recognized as one of the greatest…

  3. Actor-writer Charlie Shanian (39) divorces former Beverly Hills, 90210 actress Tori Spelling (32) only 15 months after t

    Actor-writer Charlie Shanian (39) divorces former Beverly Hills, 90210 actress Tori Spelling (32) only 15 months after their lavish $1-million wedding

  4. Nepalese security forces open fire on pro-democracy protesters demonstrating against King Gyanendra, injuring hundreds.

    Nepalese security forces open fire on pro-democracy protesters demonstrating against King Gyanendra, injuring hundreds. The protesters secure the restoration of parliament and a federal state

  5. "Dallas" actress Victoria Principal (56) divorces plastic surgeon Harry Glassman (63) due to irreconcilable differences

    "Dallas" actress Victoria Principal (56) divorces plastic surgeon Harry Glassman (63) due to irreconcilable differences after nearly 21 years of marriage

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Frequently Asked Questions

What happened on January 5, 2005?
Michael E. Brown is an American astronomer, who has been professor of planetary astronomy at the California Institute of Technology (Caltech) since 2003. His team has discovered many trans-Neptunian objects (TNOs), including the dwarf planet Eris, which was originally thought to be bigger than Pluto, triggering a debate on the definition of a planet.
Why is Eris, the largest known dwarf planet in the solar system, is discovered by th... historically important?
He is the author of How I Killed Pluto and Why It Had It Coming, published in 2010. He was awarded the Kavli Prize (shared with Jane Luu and David C.

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January 5 in HistoryYear 2005