STS-42 mission brochure, personally signed to me by Commander Ron Grabe. I received this brochure in January 1992 – only days before the mission was launched – and for a 15-year-old space enthusiast it was a priceless treasure. Image Credit: Ben Evans personal collection
One summer evening, early in August 1492 three ships – […]
Holiday Lights on the Sun: Imagery of a Solar Flare
The sun emitted a significant solar flare, peaking at 7:28 p.m. EST on Dec. 19, 2014. NASA’s Solar Dynamics Observatory, which watches the sun constantly, captured an image of the event. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. This flare is classified as an X1.8-class flare. X-class denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, etc.
> Video: Holiday Lights on the Sun
Image Credit: NASA/SDO Read More