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How much longer can we survive on Earth?

But even without such dramatic doomsday scenarios, astronomical forces will eventually render the planet uninhabitable. Somewhere between 1.75 billion and 3.25 billion years from now, Earth will travel out of the solar system's habitable zone and into the "hot zone," new research indicates.

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Even if an errant asteroid, nuclear holocaust or other disaster don't doom Earth, in another 1.75 billion years the planet will travel out of the solar system's habitable zone and into a hot zone that will scorch away its oceans, researchers find. Earth could continue to host life for at least another 1.75 billion years, as long as nuclear holocaust, an errant asteroid or some other disaster doesn't intervene, a new study calculates. But even without such dramatic doomsday scenarios, astronomical forces will eventually render the planet uninhabitable. Somewhere between 1.75 billion and 3.25 billion years from now, Earth will travel out of the solar system's habitable zone and into the "hot zone," new research indicates. These zones are defined by water. In the habitable zone, a planet (whether in this solar system or an alien one) is just the right distance from its star to have liquid water. Closer to the sun, in the "hot zone," the Earth's oceans would evaporate. Of course, conditions for complex life — including humans — would become untenable before the planet entered the hot zone. [The Top 10 Ways to Destroy Earth] But the researchers' main concern was the search for life on other planets, not predicting a timeline for the end of life on this one. The evolution of complex life on Earth suggests the process requires a lot of time. Simple cells first appeared on Earth nearly 4 billion years ago. "We had insects 400 million years ago, dinosaurs 300 million years ago and flowering plants 130 million years ago," lead researcher Andrew Rushby, of the University of East Anglia in the United Kingdom, said in a statement."Anatomically modern humans have only been around for the last 200,000 years — so you can see it takes a really long time for intelligent life to develop." Rushby and his colleagues developed a new tool to help evaluate the amount of time available for the evolution of life on other planets: a model that predicts the time a planet would spend in its habitable zone. In the research, published today (Sept. 18) in the journal Astrobiology,they applied the model to Earth and eight other planets currently in the habitable zone, including Mars. They calculated that Earth's habitable-zone lifetime is as long as 7.79 billion years. (Earth is estimated to be about 4.5 billion years old.) Meanwhile, the other planets had habitable-zone lifetimes ranging from 1 billion years to 54.72 billion years.

Related: Physicists just released step-by-step instructions for building a wormhole

"If we ever needed to move to another planet, Mars is probably our best bet," Rushby said in a statement. "It's very close and will remain in the habitable zone until the end of the sun's lifetime — 6 billion years from now." While other models have been developed for Earth, they are not suitable for other planets, he added.

Follow us @livescience, Facebook or Google+. Original article published on LiveScience.

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Peregrine White was born to William and Susanna White in November of 1620 aboard the Mayflower, while the vessel was docked off the coast of Cape Cod. Susanna was 7 months pregnant when she had boarded the ship bound for the new world.

Peregrine White was born to William and Susanna White in November of 1620 aboard the Mayflower, while the vessel was docked off the coast of Cape Cod. Susanna was 7 months pregnant when she had boarded the ship bound for the new world. The name Peregrine means ‘traveler’; he was appropriately named for the travelers to the new world. Due to the location and timing of his birth, Peregrine White is believed to be the last surviving passenger of the Mayflower and the first Mayflower descendant born in America. Peregrine was a man of many talents. He served in the military beginning at the age of 16 as a lieutenant before eventually a captain. Additionally he was also a farmer as well as a representative in the General Court. Peregrine White eventually settled in Marshfield with his wife Sarah Basset, also of Marshfield, whom he married in 1648. Sarah and Peregrine White had 7 children. Sarah’s family had a vast amount of land in Marshfield, in which Peregrine and his family settled. Peregrine up surrounding parcels of land. He lived the remainder of his life in Marshfield before passing away in July 1704 at the age of 83. The street, Peregrine White Drive, in Marshfield was named in honor of one of their most infamous residents.

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