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Astronomy Picture of the Day
Crescent Neptune and Triton
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#112019
by
[z]Barbara Harris
@
14.12.2009 00:00
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Crescent Neptune and Triton
Explanation: Gliding silently through the outer
Solar System
, the
Voyager 2 spacecraft
camera captured
Neptune
and
Triton
together in crescent phase in 1989. The
above picture
of the
gas giant planet
and its
cloudy moon
was taken from behind just after
closest approach
. It could not have been taken from
Earth
because
Neptune
never shows a crescent phase to sunward Earth. The
unusual vantage
point also robs
Neptune
of its familiar
blue hue
, as sunlight seen from here is scattered forward, and so is reddened like the
setting Sun
.
Neptune
is smaller but more massive than
Uranus
, has several
dark rings
, and emits more light than it receives from the Sun. digg_url = 'http://apod.nasa.gov/apod/ap091213.html'; digg_skin = 'compact'; New Mirror:
APOD now available in Romanian from Romania
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