But, based on the limited numbers of planets found so far, Dr Boss has estimated that each Sun-like star has on average one "Earth-like" planet.
Now only visible with the largest ground-based telescopes or from space, 1999 RQ36 currently lies about one earth-sun distance away.
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On the moon, we had one-sixth of Earth's gravity, allowing Neil and me to move around easily in the Eagle to put on equipment for our walk.
Right now, though, one of the high tech toilets - the one built in Russia - is orbiting the Earth on the international space station, and, as NPR's Nell Greenfieldboyce reports, it's partially broken.
No-one had ever circumnavigated the earth under their own steam - no motors, no sails.
As far as last-dish-on-earth-worthy dishes go, this one certainly qualifies.
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Yet, even roughly Earth-sized planets abound - more recent research suggests that one in six stars has a planet of about Earth's size in an orbit close to their host stars - making for at least 17 billion in our galaxy alone.
BBC: Exoplanets near red dwarfs suggest another Earth nearer
Science editor Alan Boyle's blog: A simulation based on data from NASA's planet-hunting Kepler mission has determined that about one out of every six stars has an Earth-sized planet, which would translate to at least 17 billion such worlds in our Milky Way galaxy.
Handling such down-to-earth concerns was one of the challenges when the Belgian creators got started.
Sorting out gods is one thing - fixing gender issues on Earth is quite another.
Outside of Mega-City One is the Cursed Earth, a.k.a. the rest of the United States, post nuclear holocaust.
But the A's have been back to the playoffs just once since 2003, while Tampa Bay has fallen to earth after a one-year joyride.
Once the preserve of only elite athletes, adventure racing has become one of the fastest-growing sports on Earth.
Despite all this, I have to say Dakota is one of the most down-to-Earth guys that you will ever meet.
That also means that Mount Sharp was formed in a different way than how mountains are created on Earth -- no one knows how.
"This will be one step in the long road to human expansion off of the planet into low-Earth orbit and beyond, " NASA astronaut Donald Pettit, one of Burbank's crewmates aboard the station, said Friday.
He said scientists have identified 95% of asteroids more than a half-mile in diameter -- the kind that threaten human existence if they strike Earth, like the six-mile-wide one believed to have wiped out dinosaurs 65 million years ago -- and found none on a collision course with the planet.
This periodic reappearance of fresh frost takes place every Pluto-year (248 Earth-years) and is the reason that Pluto is one of the most reflective surfaces in the Solar System.
It's called Medicare, and even today, it is one of the largest single-payer systems on Earth, enrolling more than 47 million people.
CNN: After the mandate, government-run health care would grow
He says a large portion of current earth-bound cities will one day choose to live in LEO skyscrapers replete with incredible view condos.
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How on earth does one deploy a billion-dollar fund these days?
Turning back to New Year festivities, The Beijing News recaps the highlights of Saturday's China Central Television's New Year evening gala, one of the most-watched television shows on Earth.
All of the SETI searching over the past 50 years is equivalent to examining one 8-ounce glass of water from the Earth's oceans -- a lot of human effort, but not a lot of exploration.
Mr Lee's struggle to win approval for the FTA in what is one of the most trade-dependent nations on earth foreshadows political problems that are almost bound to arise elsewhere during attempts to enlarge the TPP.
ECONOMIST: A battle over American-led free trade brews in Asia
Casual investors would take one look at Molycorp, the producer of rare-earth minerals used in electronics, and run away.
Today, one-and-a-half billion people on earth have no access to electricity at all, and a billion more have limited access.
It should be noted also that the 2017 maiden test flight will use a "lite" variant, one capable of lifting about 70 tonnes to low-Earth orbit.
As I talked to these women, I was struck that each one of their stories included some kind of earth-shattering experience on the path to becoming senior leaders at the UN.
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What makes this tale of amateur astral chemistry even more amazing is that cyanomethanimine is believed to be a precursor to RNA -- one of the building blocks of life on Earth.
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