Each week we feature an astronomer or planetary scientist that takes over the @astrotweeps account and tweets about their science, research, and interesting news in their field.
via About | astrotweeps
I love this. It gives insights into the scientists work, and the something about the people themselves. Each week someone new.
X-rays and ultraviolet (UV) light stream off the surface of the sun, in this false colour image from JPL, the Jet Propulsion Laboratory (now part of NASA). The X-rays are shown in green and blue, with the UV shown in red.
A lovely scale model of the solar system, using the scale of one pixel to the diameter of the moon, roughly the distance between London and Tehran.
Do note the shortcuts to the planets, the strange little hieroglyphs along the top of the page. Saves a lot of scrolling!