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  1. #1
    Sagan's Avatar Carl Sagan
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    Jupiter rules the evening sky.

    We are in the midst of the western cold snap. I've been walking the dogs around the fields about 5pm, the day is gone, but it's not quite dark enough to say dusk has taken hold. Jupiter at magnitude -2.7 shines like a beacon in the sky to the East, well below zenith. After 5 minutes or so, a few scattered stars appear and then a pinkish Aldebaran peeks out below Jupiter.

    Last evening as I watched the display unfold, I mused about the wonder of the times we live in. Documented observations of Jupiter date back to the 7th or 8th century BCE. There is a claim that a Chinese visual discovery of a moon of Jupiter was made in 362 BCE. Only in the last 50 years have we begun to understand the complexities of the Jovian system. And now, we can fully appreciate the relationship of Jupiter to our planet through photographs from space capturing both systems.

    On return from the walk I poked around and found this article on Earth and Jupiter Seen in a Single Photo Taken From Mars.

    Back on May 8th, 2003, the Mars Orbiter Camera on the Mars Global Surveyor had the rare opportunity to photograph both the Earth and Jupiter in the same region of space. It was the first planetary conjunction observed from another planet, with the Earth 86 million miles away and Jupiter 600 million miles away. The resulting image, contains both planets, along with Earth's moon and Callisto, Ganymede, and Europa.

    Here's the enlarged view pointed to by the red arrow.

    If you’re wondering why Jupiter looks larger than Earth in the photograph even though it’s so far away, it’s because of perspective distortion coupled with the fact that Jupiter is so much bigger.

    Here’s a to-scale size comparison:

    "A still more glorious dawn awaits
    Not a sunrise, but a galaxy rise
    A morning filled with 400 billion suns
    The rising of the milky way"

    "The sky calls to us
    If we do not destroy ourselves
    We will one day venture to the stars" -Carl Sagan

  2. #2
    SmileyFace's Avatar
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    Wow, small world (no....pun....intended.....?)

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