Images Dated 4th July 2003
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Featured 4 Jul 2003 Print
Comet Hyakutake on 13.3.96
Comet Hyakutake. Comet Hyakutake (at lower right), showing the comet's bright head (coma) and long tail. Comet Hyakutake or 1996 B2 was one of the brightest comets to appear in the sky this century. Comets are mostly formed of water ice and dust. They usually have a diameter of a few kilometres and orbit the Sun with highly elongated orbits. It is only when a comet approaches the Sun that the water ice vaporises to form a tail of gas and dust. This always points away from the Sun because it is blown by charged particles (the solar wind) which come out of the star. The image was taken on 13 March 1996; the brightest star (at upper centre) is Algol (Beta Persei)
© JOHN SANFORD/SCIENCE PHOTO LIBRARY
Featured 4 Jul 2003 Print
Optical CCD image of Comet DeVico
Comet DeVico. Optical CCD (Charge Coupled Device) image of Comet DeVico. The bright part (at centre left) is the nucleus of the comet whilst the tail stretches to far right. A comet is a ball of ice and dust on an elliptical orbit around the Sun. As it approaches the Sun its surface evapor- ates, releasing a tail of dust and vapour that can reach millions of kilometres in length. The tail always extends away from the Sun, whatever direct- ion the comet is travelling. This is because the dust is swept along by the solar wind, the stream of charged particles coming from the Sun. Photographed in November 1995 with a 35cm tele- scope at the OCA observatory in California, USA
© JOHN SANFORD/SCIENCE PHOTO LIBRARY
Featured 4 Jul 2003 Print
Osteoarthritis of the hip, X-ray
Osteoarthritis. X-ray of the hip joint of a65- year-old woman with osteoarthritis. The headof the femur (centre) is almost indistinguishablefrom the pelvis. A normal joint would have a clearspace between the ball of the femur and the socketof the pelvis. Osteoarthritis causes the cartilagebetween bones to break down, resulting in bonesrubbing together. It is a common but painful jointdisease that affects most people over the age of60, although more women than men are affected.There is no cure, although symptoms can berelieved with painkilling & anti-inflammatorydrugs, sever cases may require hip replacementsurgery
© Dr P.Marazzi/Science Photo Library
