Both types of star have a special property: Their intrinsic brightness is approximately known, so their distance from Earth can be estimated from their apparent brightness on the sky.
The systems have typically used either regular headlamps at half their normal brightness or special marker lamps near the headlights.
9 Celestron SkyMaster 20 £117, optical-systems.co.uk The large-aperture Celestrons have a x20-zoom special lens which maximises brightness in low-light, long-range conditions.
9 Celestron SkyMaster 20 £117, optical-systems.co.uk The large-aperture Celestrons have a x20-zoom special lens which maximises brightness in low-light, long-range conditions. 10 Steiner Commander XP £489, cliftoncameras.co.uk A pair of auto-focus binoculars made for use at sea.
The latest Gaia observations have advanced this effort by identifying dozens of new Cepheid stars, which have the special feature that their light flickers at a rate that is directly linked to their brightness at source.
Samsung continues to make improvements to the older monitor technology and has developed the SyncMaster 957MB, which might have special appeal for those with both brightness and budget in mind.
You could zoom, adjust the brightness, tweak the audio and add special effects — things you cannot currently do with the embedded video software on the iPhone 3GS.
To increase their brightness, the screens will be backlighted by special white, light-emitting diodes rather than fluorescent lamps like those normally employed in laptop computers.
New features, such as light-emitting diodes that consume tiny amounts of power, special reflective films and sensors that automatically adjust TV brightness to a room's viewing conditions, are driving down electricity consumption, experts said.
After Dr. Nayar's image is collected and stored, special software reconstructs an image with a wide range of brightness variations.
