Franklin Fact Archive
Back to Franklin Facts homepage.
Back to TV12
TUESDAY DECEMBER 5 - TWILIGHT NIGHTS
(This Franklin Fact was prepared by Franklin Institute Chief Astronomer Derrick Pitts)
It's important to understand that as the earth whirls through space, it blocks the
light of the sun. The shadow it creates provides us with "night." Night is when we
generally observe the depths of the universe.
But during the limited time of twilight, just after the sun sets and before darkness
falls, is the time that we can see satellites. You can look for the Hubble space telescope,
international space station Alpha or even any of NASA's space shuttles, when sent to
serve the space station. They look like bright moving stars.
During evening twilight this fall, our solar system's two biggest planets, Jupiter and
Saturn, are easily seen in the east as two brilliant star-like objects. The brilliant
planet Venus can be seen in the western sky. In the morning it's Mars and Mercury in
the east. Remember: stars twinkle, planets don't. Watch the sky as earth rotates into
night some evening. You'll be amazed at what you can see.