The planet has crossed the halfway mark a few years ago.

Climate changes can influence a planet's geological history.

Pallene ( ) is a very small natural satellite of Saturn.

Hydrogen, oxygen, carbon and sulfur have been detected in the planet's inflated atmosphere.

Analysis of three years of data was required to find its signal.

The atmosphere of Jupiter is the largest planetary atmosphere in the Solar System.

Secondly, the distance from the Sun determines the energy available to heat atmospheric gas to the point where its molecules' thermal motion exceed the planet's escape velocity, the speed at which gas molecules overcome a planet's gravitational grasp.

This telescope can produce useful images of the planet when it is at an angular distance of at least 50 from the Sun.

Running horizontally along the graph, is ecological footprint, which is a measure of how much resources we use and how much pressure we put on the planet.

However, the exosphere can extend from 500 up to 1,000 km above the surface, where it interacts with the planet's magnetosphere.

Ptolemy modified the model of planetary motion by adding a point offset from the center of the planet's circular orbit about which the planet moves at a uniform rate of rotation.

Neptune's moons are an exception, as they are likely reaggregates of the pieces of the original bodies, which were disrupted after the capture of the large moon Triton.

They see the damaging effects of chemicals and toxic and harmful substances that are used in or produced by industrial activity, and they know that demands on energy, land and forests are outstripping the planet's natural capacity.

Legendary ocean researcher Sylvia Earle shares astonishing images of the ocean and shocking stats about its rapid decline as she makes her TED Prize wish that we will join her in protecting the vital blue heart of the planet.

If you're trying to influence corporations to change their behavior, with regard to producing pollutants, one approach, the common approach, is to exhort them to be better, to explain to them what damage they're doing to the planet.

If someone comes to you with a plan that really looks like it might be part of this solution, are you ready to invest in those technologies, even if they aren't maximized for profits, they might be maximized for the future health of the planet?

I wish you would use all means at your disposal films, expeditions, the web, new submarines and campaign to ignite public support for a global network of marine protected areas hope spots large enough to save and restore the ocean, the blue heart of the planet.

Especially if you breathe air, it's very hard to get from planet A to planet B, because there's no air in between. But if you breathe air you're dead as soon as you're off the planet, unless you have a spaceship.

But it shows that we are interconnected, among many systems on the planet, with the three big systems, climate change, stratospheric ozone depletion and ocean acidification being the three big systems, where the scientific evidence of large scale thresholds in the paleo record of the history of the planet.

Clearly, humans who now occupy almost 40 of the planet s ice free land surface are shaping many of the planet s fundamental processes. According to Nobel laureate Paul Crutzen, this shift is so profound that it amounts to the beginning of a new epoch the Anthropocene.

But if you live in a vacuum, if you live on the surface of one of these objects, say, in the Kuiper Belt, this an object like Pluto, or one of the smaller objects in the neighborhood of Pluto, and you happened if you're living on the surface there, and you get knocked off the surface by a collision, then it doesn't change anything all that much.