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Home > Science Photo Library > Images Dated > 2005 > September > 21 Sep 2005

Images Dated 21st September 2005

Available as Framed Prints, Photos, Wall Art and Gift Items

Choose from 39 pictures in our Images Dated 21st September 2005 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery. We are proud to offer this selection in partnership with Science Photo Library.

Nova in Scorpius, July 2005 Featured 21 Sep 2005 Print

Nova in Scorpius, July 2005

Nova in Scorpius. The position of this nova, 1737-34 Nova Scorpii 1, is shown by the cross- hairs. A nova is a huge brightening of a double star system, which makes a previously unseen star visible for a short time. It occurs when one star is a small, dense white dwarf and the other is much larger. The white dwarf accretes hydrogen gas from the larger star onto its surface. Once a specific amount of hydrogen has accreted, it becomes dense enough for nuclear reactions to begin, and it ignites. This blows away the remaining gas layers, so the brightening is short- lived, usually only lasting a few days. This nova was discovered on 25th July 2005


Semiconductor components Featured 21 Sep 2005 Print

Semiconductor components

Semiconductors. Selection of various applications of semiconductors. Semiconductors are materials with properties between those of conductors and insulators. Combinations of different types of semiconductors allow the design of various types of electronic components to manipulate the flow of electric current. Semiconductor technology is crucial to the operation of technology such as computers. Components seen here include computer microchips (centre left and centre right), LEDs (light emitting diode, red and green, centre), as well as various other diodes, resistors and (at left of the LEDs) capacitors


Chromatic aberration Featured 21 Sep 2005 Print

Chromatic aberration

Chromatic aberration, seen through a lens that is also showing the words 'chromatic aberration'. Unless it is engineered to be achromatic, a lens will separate light that passes through it. This produces the fringe of colours seen here. This effect was a major obstacle to the manufacture of good quality telescopes and microscopes, and it was not until achromatic lenses were perfected that further discoveries could be made using telescopes and microscopes