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Files-France-Philippe Petit-Notre-Dame

(FILES) In this file photo taken on June 25, 1971 French highwire artist Philippe Petit walks between the steeples of Notre Dame de Paris Cathedral in Paris. - A huge fire swept through the roof of the famed Notre-Dame Cathedral in central Paris on April 15, 2019, sending flames and huge clouds of grey smoke billowing into the sky. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year. (Photo by STF / AFP)

Flight simulation of a harrier jump-jet

Harrier aircraft flight simulation. Supercomputer image of a Harrier aircraft hovering over a runway in a virtual wind tunnel. The lines beneath the aircraft show the air flow from the aircraft's engine. The lines colours show the air's tempera- ture gradient, from red (highest), through orange, yellow, green, and blue, to purple (lowest). The Harrier is a Vertical Take-Off and Landing (VTOL) fighter aircraft which directs air from its Rolls- Royce Pegasus engine through 4 swivelling nozzles along the side of its fuselage. The nozzles point downwards for take-off, before rotating backwards to accelerate the aircraft into wing-borne flight

© NASA AMES RESEARCH CENTRE/SCIENCE PHOTO LIBRARY

Gas pillars in the Eagle Nebula

Gas pillars in the Eagle Nebula. Hubble Space Telescope image showing dark pillars of dense molecular hydrogen and dust in the Eagle Nebula (M16). Ultraviolet light from young stars (out of frame) evaporates gas from the 1 light-year long pillars, creating the blue halo-like effect. The small protrusions on the pillars contain globules of even denser gas which are embryonic stars; these have been dubbed Evaporating Gaseous Globules, or EGGs. The evaporation of the pillar limits the amount of gas and dust which these embryonic stars can gather. The Eagle Nebula is about 7000 light years from Earth

© NASA/ESA/STSCI/J.HESTER & P.SCOWEN, ASU/SCIENCE PHOTO LIBRARY