Picture of the day for October 21, 2017

Wikipedia picture of the day on October 21, 2017: An F-16 Fighting Falcon receives fuel from a Boeing KC-135 Stratotanker en route to Barksdale Air Force Base (Louisiana, USA) to take part in Exercise Green Flag East. The exercise is a pre-deployment exercise for Air Combat Command flying units that perform close-air support and precision-guided munitions delivery. The F-16 is from the 120th Fighter Squadron of the Colorado Air National Guard. https://commons.wikimedia.org/wiki/File:F-16_refuelling,_Exercise_Green_Flag_East_-_081201-F-3071N-235.jpg

Hubble Unravels a Twisted Cosmic Knot

This Hubble image shows what happens when two galaxies become one. The twisted cosmic knot seen here is NGC 2623 — or Arp 243 — and is located about 250 million light-years away in the constellation of Cancer (The Crab). via NASA http://www.nasa.gov/image-feature/goddard/2017/hubble-unravels-a-twisted-cosmic-knot