Killer Whales (Orcinus orca) spy-hopping to observe Weddell Seal (Leptonychotes weddellii)
Killer Whales (Orcinus orca) spy-hopping to observe Weddell Seal (Leptonychotes weddellii) in preparation to knock it from the ice by creating a wave. Marguerite Bay, Antarctic Peninsula, summer. Freeze Frame book plate page 122-123. Taken on location for BBC series Frozen Planet
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Thames Estuary during the winter of 1947
A scene during the great freeze of 1947, one of the harshest winters known in Britain. At Leigh-on-Sea in Essex, a boatman is pictured rescuing his dinghy from the encircling ice which makes the Thames Estuary look more like a Polar landscape. Only by moving their craft every twenty-four hours could boat owners hope to ensure that they would escape damage from ice pressure.
© Mary Evans Picture Library 2015 - https://copyrighthub.org/s0/hub1/creation/maryevans/MaryEvansPictureID/10270904
Artist's concept of an impact crater on Jupiter's moon Ganymede, with Jupiter
Artist's concept of an impact crater on Ganymede, about 10 miles in diameter, dominates a scene otherwise defined by a dozen long ridges. In the middle of the crater is a central peak, formed when the energy of the impact liquefied the crust long enough for it to rebound upward and solidify once again.
Immediately above the horizon, Jupiter is still a majestic spectacle, even at a distance of nearly three times that between the Earth and its moon. Much closer on the upper right is Ganymede's sister satellite Europa. At a distance of 307 thousand miles from this vantage point, Europa is only a quarter again as far as the Earth is from its moon. To the lower left of Jupiter at nearly a million miles is Jupiter's volcanic satellite Io.
Jupiter's largest satellite Ganymede has a varying surface, some of which is characterized by rumpled bundles of ridges and grooves that run for hundreds of miles over a frozen surface of water-ice. They probably formed long ago when tectonic forces pulled apart Ganymede's upper crust; similar sets of faults occur in rift zones on Earth, as in eastern Africa. Subsequent meteoritic impacts have peppered, and broken in places, the continuity of the running formations.
© Walter Myers/Stocktrek Images