Gallery: Space Photos of the Week: Mystery Supernova Won’t Say Where It’s From
<a href="https://www.nasa.gov/image-feature/goddard/2017/wispy-remains-of-supernova-explosion-hide-possible-survivor">NASA</a>01SPoW-30-08.jpg
The brightness of this type of exploding stars, called Type Ia, helps astronomers measure the expanding universe and understand dark energy, but scientists are still unsure how the supernovas form.
<a href="https://www.nasa.gov/image-feature/goddard/2017/hubbles-double-galaxy-gaze-leda-and-ngc-4424">ESA</a>02SPoW-30-09.jpg
This image, taken by Hubble, shows two galaxies: NGC 4424, and a smaller, flatter galaxy below it, named LEDA 213994.
<a href="https://www.nasa.gov/image-feature/jpl/pia21572/the-splitting-of-the-dunes">NASA</a>03SPoW-30-01.jpg
In this group of dunes, located near the pit at the center of a 22-mile-wide impact crater on Mars, smaller dunes run perpendicular to larger ones, likely indicating shifting wind directions.
<a href="https://www.nasa.gov/feature/jpl/nustar-probes-puzzling-galaxy-merger">NASA</a>04SPoW-30-03.jpg
In this image, a large disk galaxy is merging with a dwarf galaxy. The smaller galaxy hosts a supermassive black hole, which makes up over 2% of its mass. It's expected to merge with the larger a galaxy's black hole in a few hundred million years.
<a href="http://www.eso.org/public/images/potw1713a/">ESO</a>05SPoW-30-07.jpg
In this photo, ESO’s Very Large Telescope lies beneath the Milky Way. The star-filled galactic bulge lies towards the top of the image.
<a href="https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21387">NASA</a>06SPoW-30-04.jpg
The enhanced color and contrast in this image highlights a swirling storm on Jupiter, taken from 12,400 miles away.
<a href="https://www.nasa.gov/image-feature/jpl/pia21437/earhart-propeller-in-saturns-a-ring">NASA</a>07SPoW-30-06.jpg
This image shows an individual propeller, or disturbance, in Saturn’s A Ring, caused by a moonlet.
