Dimming Starlight
Part of Hall of the Universe.
![Dimming Starlight](/var/ezflow_site/storage/images/media/amnh/images/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/hall-of-the-universe2/calder/dimming-starlight/1001908-1-eng-US/dimming-starlight_wideexact_2460.jpg 2460w,/var/ezflow_site/storage/images/media/amnh/images/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/hall-of-the-universe2/calder/dimming-starlight/1001908-1-eng-US/dimming-starlight_wideexact_1230.jpg 1230w,/var/ezflow_site/storage/images/media/amnh/images/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/hall-of-the-universe2/calder/dimming-starlight/1001908-1-eng-US/dimming-starlight_wideexact_800.jpg 800w,/var/ezflow_site/storage/images/media/amnh/images/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/hall-of-the-universe2/calder/dimming-starlight/1001908-1-eng-US/dimming-starlight_wideexact_400.jpg 400w)
Telescopes can easily zoom in on a star. But to see a dim object next to a star, such as a planet, astronomers need to block out the star’s light. A coronagraph attached to a telescope can eliminate nearly all the starlight, revealing dim objects nearby. With this coronagraph, researchers made the first discovery of a starlike object called a brown dwarf. Today coronagraphs are helping astronomers search for new planets.
Hidden Planets
If you looked at our Sun from a telescope 30 light years away, its light would be so bright it would obscure all the planets. Using a telescope with a coronagraph, Jupiter and Saturn would become visible.
The coronagraph in this case was attached to the 60-inch (1.5 meter) wide telescope at the Palomar Observatory in southern California. With it, researchers made the first discovery of a brown dwarf as well as several "debris disks" where planets take shape.
AMNH/D. Finnin