Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2016 October 15
See Explanation.  Clicking on the picture will download
 the highest resolution version available.

Gemini Observatory North
Image Credit & Copyright: Joy Pollard (Gemini Observatory)

Explanation: It does look like a flying saucer, but this technologically advanced structure is not here to deliver the wise extraterrestrial from the scifi classic movie The Day the Earth Stood Still. It is here to advance our knowledge of the Universe though. Shown sitting near the top of a mountain in Hawaii, the dome of the Gemini Observatory North houses one of two identical 8.1-metre diameter telescopes. Used with its southern hemisphere twin observatory in Chile, the two can access the entire sky from planet Earth. Constructed from 85 exposures lasting 30 seconds each with camera fixed to a tripod, the image also clearly demonstrates that the Earth did not stand still. Adjusted to be slighter brighter at the ends of their arcs, the concentric star trails centred on the North Celestial Pole are a reflection of Earth's rotation around its axis. Close to the horizon at Hawaiian latitdues, Polaris, the North Star, makes the shortest star trail. The fainter denser forest of star trails toward the right are in the rising Milky Way.

Tomorrow's picture: venusian cylinder

< | Archive | Submissions | Search | Calendar | RSS | Education | About APOD | Discuss | >

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
NASA Web Privacy Policy and Important Notices
A service of: ASD at NASA / GSFC
& Michigan Tech. U.