Cosmic microwave background
Cosmic microwave background. Spherical projection of the cosmic microwave background, using all-sky data from the WMAP (Wilkinson Microwave Anisotropy Probe). Since it is a spherical projection, it only shows half the sky. The microwave background is radiation from the beginning of the universe (actually 380, 000 years after its creation) that has been stretched (cooled to around 3 Kelvin) by the expansion of the universe. The colours show the variation in the temperature (then equivalent to density) of the early universe. Denser regions (red, yellow) formed the seeds of galaxies and other structures. Data obtained in 2003.
© NASA/WMAP SCIENCE TEAM/SCIENCE PHOTO LIBRARY
North America at night, satellite image
Africa at night. Satellite image of the Earth at night, set against a background of stars, centred on the continent of Africa. North is at top. City lights (yellow) show areas of dense population. Most of Africa is dark in comparison with the bright lights of the cities of Europe and the Middle East (across top). Rural and undeveloped areas in Africa include the vast Sahara desert in the north, tropical forests in central Africa, and the savannah and deserts of eastern and southern Africa. City lights seen outside Africa and Europe include part of South America (lower left), India (upper right) and islands in the Atlantic and Indian oceans. Image data obtained in 2001 by the Defense Meteorological Satellite Program (DMSP).
© NASA/NOAA/SCIENCE PHOTO LIBRARY
Water droplets, rain or watering can, falling on a Zinnia flower
© FLPA/Nigel Cattlin
Abstract, Back Ground, Can, Close, Drop, Droplet, Droplets, Drops, Falling, Flower, Garden, Hose, Hose Pipe, Pipe, Rain, Saturated, Water, Watering, Zinnia