It's a once in a lifetime event: the June 5th Transit of Venus across the sun. Watch the world wide webcast sponsored by the Coca-Cola Science Center and NASA.
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ISS TRANSIT OF VENUS: High above Earth, astronaut Don Pettit is about to become the first human to witness and photograph a transit of Venus from space. His images and commentary will be streamed to Earth during the crossing. [full story] [video]
VENUS AND MERCURY: Venus and Mercury are crossing paths today; Mercury is heading away from the Sun, Venus toward it. Pete Lawrence photographed them both in broad daylight from his backyard observatory in Selsey, UK:
"The planets were around 1 degree apart when I caught them through a break in the clouds," says Lawrence.
The big disk of Venus has transformed into a slender crescent as the planet turns its night side toward Earth ahead of the June 5th solar transit. The crescent could soon become a ring. When Venus is less than few degrees away from the sun, the horns of the crescent sometimes reach around and touch, producing a complete annulus. The effect is caused by particles in upper layers of Venus's atmosphere which scatter sunlight around the circumference of the planet. The ring is very difficult to observe, and often only black-belt astrophotographers are able to record the phenomenon.
Keep an eye on SpaceWeather's realtime photo gallery to see how Venus shape-shifts in the days ahead:
Space Weather Real Time Image Gallery
[Submit your photos] [NASA videos: 2012 Transit of Venus, ISS Transit of Venus]
CORONAL HOLE: Spewing solar wind, a yawning dark fissure in the sun's atmosphere is turning toward Earth. NASA's Solar Dynamics Observatory photographed the "coronal hole" during the early hours of June 1st:
Coronal holes are places where the sun's magnetic field opens up and allows the solar wind to escape. A stream of solar wind flowing from this coronal hole will reach Earth on June 5th - 7th, possibly stirring geomagnetic storms. High-latitude sky watchers should be alert for auroras. Aurora alerts: text, voice.
Potentially Hazardous Asteroids (PHAs
) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones
all the time.
On June 1, 2012 there were 1293 potentially hazardous asteroids. Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.
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