What's Unusual About Mercury? | NASA Planetary Sciences

Discover why Mercury has a tail like a comet, and why its poles are covered in ice despite its close proximity to the Sun. Mercury, the closest planet to the Sun, rotates three times on its axis every two of its years. Despite having temperatures that are hot enough to melt lead, the tilt of the planet's axis allows for ice to exist at its poles. A mysterious dark substance that researchers suspect may be organic coats the ice. Mercury also has a tail created by exposure to the solar wind. The MESSENGER spacecraft arrived at Mercury at a great time to study the planet in 2011, while the Sun was near the maximum of its activity cycle. CREDITS: https://www.pbslearningmedia.org/credits/npls13.sci.ess.eiu.unmerc/ LICENSE: https://www.pbslearningmedia.org/help/full-license-for-section-3c-of-terms-of-use-download-and-share/

LicenseCustom License

More videos by this producer

ScienceCasts: Predecir inundaciones

El rastreo de inundaciones basado en satélites, fundamental para la respuesta de los equipos de socorro en casos de catástrofe: http://www.nasa.gov/feature/goddard/satellite-based-flood-monitoring-central-to-relief-agencies-disaster-response Visita http://science.nasa.gov/ para más información. Par

ScienceCasts: Un buen año para las perseidas

Esta semana, la Tierra atraviesa una corriente de escombros del cometa Swift-Tuttle, fuente de la lluvia de meteoros perseidas anual. Los meteorólogos dicen que el espectáculo podría ser especialmente bueno este año porque la Luna es casi nueva cuando la lluvia alcance su punto máximo el 1 de agosto