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StarDate Online | Solar System Guide | Earth and Moon http://stardate.org/resources/ssguide/earth_and_moon.html

Definition
Atmosphere: The layers of gas that are gravitationally bound above the surface of a planet, moon, or outer layers of a star.

Stargazing Tip
November 15, 2009: The Leonid meteor shower peaks this week. It occurs when Earth crosses the orbital path of Comet Tempel-Tuttle, which is strewn with bits of dust from the comet. When the particles hit Earth's atmosphere they vaporize, forming bright streaks of light. Check the Sky Almanac for more information.

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Title	Air Date
Evangelista Torricelli	October 15, 2008
Solar Influence	July 21, 2008
Seasonal Sights	June 20, 2008
Twilight	June 16, 2007
Cosmic Rays and Lightning	May 16, 2007
Note: Audio versions of our programs will be available the day after they air. Visit the transcript page to listen.

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High Moon	High-Flying Astronomy	Relentless Beauty	High Sunset	High Moon

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Question

When does the young Moon first become visible in the evening sky?

Why are many observatories located on mountaintops?

Why aren't stars visible in the daytime?

Why do stars twinkle?

StarDate Online | Solar System Guide | Earth and Moon http://stardate.org/resources/ssguide/earth_and_moon.html

StarDate Online | Solar System Guide | Titan http://stardate.org/resources/ssguide/titan.html

StarDate Online | Solar System Guide | Venus http://stardate.org/resources/ssguide/venus.html

StarDate Online | Solar System Guide | Mars http://stardate.org/resources/ssguide/mars.html

StarDate Online | Solar System Guide | Home Sweet Home http://stardate.org/resources/ssguide/solar_system.html

StarDate Online | Solar System Guide | Explorations of Minor Bodies http://stardate.org/resources/ssguide/explorations_minor.html

StarDate Online | Solar System Guide | Uranus http://stardate.org/resources/ssguide/uranus.html

StarDate Online | Solar System Guide | Mercury http://stardate.org/resources/ssguide/mercury.html

StarDate Online | Solar System Guide | Asteroids http://stardate.org/resources/ssguide/asteroids.html

StarDate Online | Activities | Rock Cycle http://stardate.org/teachers/activities/rockcycle.html

StarDate Online | Solar System Guide | Meteorites http://stardate.org/resources/ssguide/meteorites.html

StarDate Online | Solar System Guide | Jupiter http://stardate.org/resources/ssguide/jupiter.html

StarDate Online | Solar System Guide | Inner Planets: Exploring Our Own Back Yard http://stardate.org/resources/ssguide/inner_planets_more.html

StarDate Online | Solar System Guide | Explorations in 2006 http://stardate.org/resources/ssguide/explorations2006.html

StarDate Online | Solar System Guide | Neptune http://stardate.org/resources/ssguide/neptune.html

StarDate Online | News | Two Discoveries Reveal Diversity of Galaxy's Extrasolar Planets http://stardate.org/resources/news/planets/200606.html

StarDate Online | Solar System Guide | Pluto http://stardate.org/resources/ssguide/pluto.html

StarDate Online | Solar System Guide | Saturn http://stardate.org/resources/ssguide/saturn.html

StarDate Online | Solar System Guide | Explorations in 2007 http://stardate.org/resources/ssguide/explorations2007.html

StarDate Online | Solar System Guide | Explorations in 2005 http://stardate.org/resources/ssguide/explorations2005.html