I took this picture of the James Webb Space Telescope on 26-Apr-2017 as it was in the NASA-Goddard clean room. The telescope underwent some tests at Goddard and is about to be shipped to the Johnson Space Center. Note the segmented mirror, and the three side segments that are folded back. The people in the bottom right give an idea of how big the mirror is.

This image was obtained by the IRIS spacecraft on 30 August 2013. It's not a regular image as time is along the X-axis and what is seen is the change over 50 minutes in the brightness of a narrow section of the Sun that is 17,000 km long (almost 1.5 times the diameter of the Earth). The location is just to the north of a sunspot, which is the dark area at the bottom of the image, and light comes from ionized magnesium at a temperature of about 10,000 K. The dark cloud-like features are material that rises and falls to the Sun's surface. Note the faint vertical striations across the image - I don't know what these are!

The left panel shows AIA 171 angstrom images for a sunspot observed on 3-Oct-2014, showing loops at about 800,000 K. The right panel shows images from the IRIS Slit-Jaw Imager at 1400 angstroms, showing emission around 80,000 K.  Many loops are rooted in the sunspot's umbra, and the bases of the loops are seen to oscillate with a period of about 3 minutes.

Page maintained by Dr Peter R Young.