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The heliosphere is the sun’s extended atmosphere that surrounds the entire solar system. It is a vast, bubble-like region of space which surrounds and is created by the Sun.

February 7, 2019

How Does Sunlight Push Asteroids?

Near-Earth asteroids like Bennu pose a potential danger to our planet, so it's important to predict their orbits with great accuracy. Unfortunately, a phenomenon called the Yarkovsky effect can make these predictions difficult over long time periods. How does this effect work?
August 19, 2013

SOHO/LASCO C3 Sees a Very Bright Kreutz-group Sungrazing Comet

“One of the brightest Sungrazers we’ve seen in a long time …”, tweeted Karl Battams (@SungrazerComets) of NRL’s Sungrazing Comets Project. Battams estimates the comet to be approximately 30-50 kilometers wide and expects it to reach speeds of at least 500 […]
February 28, 2013

Van Allen Probes Discover a 3rd Radiation Belt around Earth

Learn about this new result in a video by NASA Goddard Heliophysics Division. NASA presented these results at a press conference today. Tomorrow I will be on a Google Hangout with several of my colleagues at NASA Goddard. http://bit.ly/YzL5Mz Ask […]
December 15, 2011

Lovejoy’s Last Day – Unprecedented Multi-spacecraft Observations of a Comet’s Demise (Surprise filled update 12/16/2011)

UPDATE: Lovejoy survived despite most predictions to the contrary! Check out the videos below. A sungrazing comet called Lovejoy is near what will surely be its end. Sungrazers melted by the Sun is not really new. In fact, SOHO has become […]