Meade claims this will be followed by a "Millennium of peace".
Not surprisingly, Meade's wacky prediction was disavowed by the Roman Catholic church, as well as other branches of Christianity.
The space agency wrote on their website: "Various people are "predicting" that world will end September 23 when another planet collides with Earth".
"The Nibiru cataclysm is a supposed disastrous encounter between the Earth and a large planetary object (either a collision or a near-miss) which certain groups believe will take place in the early 21st century", according to a Wikipedia excerpt. The NASA, by one side, updated on Wednesday a round of questions and answer to clarify people's minds about the final days of the world.
Meade said his prediction is based on verses and numerical codes found in the Bible, specifically in the apocalyptic Book of Revelation.
For Meade, all the natural disasters the world has suffered, and the most recent solar eclipse, meant something. However, we all lived to see another day (and possibly sleep off a New Year's hangover).
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"The world is not ending, but the world as we know it is ending", David Meade told the Washington Post. "It's a very biblically significant, numerologically significant number".
Meade said the Bible's Book of Revelation describes September 23 as the day a series of catastrophic events begin. "I'm talking astronomy. I'm talking the Bible ... and merging the two".
There are 33 days between today and August 21.
NASA has said "Nibiru" or "Planet X" doesn't exist and this is a hoax. "Yet, it is still a reminder that we need to think critically about all the news".
However, a combination of Christian numerology, signs in the stars, and a fictional planet named Nibiru heading towards the Earth have proven a more compelling narrative for many doomsday theorists. The space agency has reportedly known about the Nibiru conspiracy theory for years and shot down the talk of Armageddon in a 2012 statement.