National Aeronautics and Space Administration

Goddard Space Flight Center

Sun-Earth Day 2010: Ancient Mysteries, Future Discoveries

Past Sun-Earth Days

Sun-Earth Day 2012:Transit of Venus

2012: Transit of Venus

Witness the Transit of Venus!

Sun-Earth Day 2011

2011: Ancient Mysteries-Future Discoveries

'Ancient Mysteries-Future Discoveries' opens the door to a much deeper understanding of our Sun and its impact across the ages.

Sun-Earth Day 2010

2010: Magnetic Storms

Magnetic Storms! Explore the effects of the Sun's magnetic fields on Earth.

Sun-Earth Day 2009

2009: Our Sun, Yours to Discover

Join us for Sun-Earth Day and the International Year of Astronomy as we explore, experience, study and predict our sun.

Sun-Earth Day 2008

2008: Space Weather Around the World

For Sun-Earth Day 2008, we will engage a world-wide audience in the celebration of the International Heliophysical Year (IHY).

Sun-Earth Day 2007

2007: Living in the Atmosphere of the Sun

We kick off the International Heliospheric Year celebration with Living in the Atmosphere of the Sun!

Sun-Earth Day 2006

2006: Eclipse, In a Different Light

Join us in an extraordinary journey of exploration, discovery and understanding of the total solar eclipse of March 29, 2006!

Sun-Earth Day 2005

2005: Ancient Observatories Timeless Knowledge

The Ancient Observatory theme for 2005 features solar alignments with structures that mark the equinoxes and/or solstices.

Sun-Earth Day 2004

2004: Venus Transit

Learn more about the transit of Venus that occurred on June 8, 2004. In this site you will find comparisons of Venus with Earth and Mars, calculations of the distances to nearby stars, and the use of transits to identify extra-solar planets.


A sunspot can have a magnetic field with a strength up to 10,000 Gauss, but they live very short lives!