They flew on two suborbital and four Earth-orbital Mercury launches, nine Earth-orbital Gemini flights, two Earth-orbital Apollo tests, and two lunar-orbital tests that made those lunar surface landings possible.
It recommended using geometric lines of latitude and longitude to convey a three-dimensional Earth on a two-dimensional surface, and it included the co-ordinates of over 8, 000 locations in the ancient world.
Friends of the Earth and Greenpeace, two environmental-lobbying groups, have given warning that biofuels may not be as eco-friendly as they seem.
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In the past, a one- to two-degree drop was all it took to plunge the Earth into the Little Ice Age.
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Since oceans cover two-thirds of the Earth's surface, it's more likely debris will hit water than land.
The report listed nine objects that came within two lunar distances of the Earth - about 800, 000 km (497, 120 miles) - since 1991.
These oceans, and the fish that live there, are full of plastic, reduced to confetti, incessant from shore to shore, spread out like a spoonful of sand across a football field, over two-thirds of the Earth's surface.
All crop plants have relatives somewhere on the earth, and some gene-flow commonly occurs when two plants are grown close together.
The first, called Kepler-34b, orbits its two small stars in a system about 4, 900 light-years from Earth.
In our Solar System, we believe the Sun has accreted about two-and-a-half Earth-masses of rocky material.
Finding out just how common exoplanets are particularly the rocky, Earth-like sort will be the task of two space-based telescopes to be launched within the next couple of years.
The satellite is also expected to drop off two secondary "passengers" - an Earth observation spacecraft for Vietnam and a "nanosatellite" built by students in Estonia.
"We're hemmed in between two of the most populous and powerful nations on earth--India and China--and it's important that people realize the future survival of Bhutan doesn't depend on any single individual, " the King told TIME.
The residents were represented in court for the two-day hearing by campaign group Friends of the Earth.
Forty-two years ago, a generation rallied together to protect the earth we would inherit.
The ultimate model here is Silicon Valley, where two-legged assets probably matter more than anywhere else on earth.
Last month, scientists announced that Kepler had discovered two of the most intriguing candidates yet in the search for Earth-like exoplanets.
The accommodations feature earth tone colours, a fully equipped kitchen, two queen beds, a queen-size pull-out couch and a welcome basket for escapees.
Of course, during most of that 4.5 billion year history, the earth was not populated by intelligent life -- human beings who might have noticed the two events happening on the same day.
In August 2011, Speth and his chief engineer finally broke through more than two meters of earth and reinforced concrete and the shelter's 278-millimeter-thick ceiling to emerge into a 40-square-meter space, divided into five interconnecting rooms by heavy metals doors.
The two superpowers are competing over a valuable new resource -- the rare earth elements used in the construction of nearly all smartphones, tablets and other electronic gadgets.
Just a day after announcing the discovery of the first Earth-size planets ever detected outside our Solar System, scientists have confirmed the existence of two even smaller worlds.
Almost two-thirds of the stars likely host a planet measuring about five times Earth's mass, and half of them harbor a planet about the mass of Neptune.
In a sense he has separated the quasi-mystical divine function of God's representative on Earth from the very down-to-earth job of administering the world's oldest international organisation, one which has survived two millennia of schisms, would-be reformers and wars, as well as territorial, family and political ambitions.
The other two shuttles -- Challenger and Columbia -- did not make it back to Earth after accidents that killed their entire crews.
How on earth can the stock market be going up (we just had the biggest one-week rally in two years) with these imposing and potentially long-lasting problems all around us?
Two thousand years hence, Sherwood says hypothesized collections of Asteroidal materials congregating at the Earth-Sun L4 and L5 gravitational equilibrium points would make for building materials to construct a large rotating pancake disk capable of housing thousands of people in the comfort of a free-breathing atmosphere and some form of artificial gravity.
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' One of the most romantic on earth, the trip can be done either by felucca or, for more comfort, in a two-masted, luxury dahabiya.
In the living room, two wool-covered dog beds take center stage, flanking the central wooden bench along with earth-toned couches.
This summer, two of them merged to form a single oval, larger than the earth, making the second-biggest storm in the solar system after the Great Red Spot.
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