Stability of the Solar System that keeps the far side of the Moon away from the Earth. Mercury is in a 3:2 spin–orbit resonance. The planets' orbits are chaotic over longer timescales, such that the whole Solar System possesses a Lyapunov time in the range of 2–230 million years. In all cases this means that the position of a planet along its orbit ultimately becomes impossible to predict with any certainty (so, for example, the timing of winter and summer become uncertain), but in some cases the orbits themselves may change dramatically. Such chaos manifests most strongly as changes in eccentricity, with some planets' orbits
Terra: The Nature of Our World Award and a WEBBY Award in the Green category. As - TERRA: The Nature of Our World—lifeonterra.com was a finalist at the 2008 Wildscreen Film Festival in Bristol in the "New Media" Category. As - TERRA: The Nature of Our World—lifeonterra.com was a Finalist at the 2007 SxSW Interactive Festival in the Student Category. As - TERRA: The Nature of Our World-lifeonterra.com won the 2007 Webby for Student Online Film and Video ². As - TERRA: The Nature of Our World—lifeoneterra.com was a finalist at the 2007 Jackson Hole Wildlife Film Festival in the 'Best use of New Media Category'.