POTD / Daily Space & Astronomy Photos

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THEMIS Image of the Day
Daily images from the Mars Odyssey THEMIS instrument.

Dark Slope Streaks
29 Aug 2014

Ares Vallis
28 Aug 2014

The definitive source of information about the Hubble Space Telescope
27 Aug 2014
Latest Picture from Hubble!

NASA Telescopes Help Uncover Early Construction Phase Of Giant Galaxy

RedOrbit Images Of The Day - Mars
Fresh Impact Crater
Fresh Impact Crater
29 Aug 2014
InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) is a NASA Discovery Program mission that will place a single geophysical lander on Mars in September 2016 to study its deep interior.

InSight needs seismic signals, and one sure way to get them is from the impact of bolides onto Mars. InSight can detect large impacts that are far from the lander and smaller impacts that are closer.

This recent HiRISE image, acquired to certify a landing site for the mission, shows a distinctive crater with a very sharp rim and ejecta that is darker and bluer than almost all of this dust-covered region. This must be a very recent impact because there hasn\'t been sufficient time for atmospheric dust to settle over this spot and re-brighten the surface.

In fact, previous images suggest it formed between 2008 and 2012. This illustrates the type of feature that orbiting cameras will search for during the InSight mission, to attempt to correlate seismic signals to the point of origin.

Written by: Alfred McEwen

Credit: NASA/JPL/University of Arizona

RedOrbit Images Of The Day - Universe
When Galaxies Collide
When Galaxies Collide
29 Aug 2014
The NASA/ESA Hubble Space Telescope and many other telescopes on the ground and in space have been used to obtain the best view yet of a collision that took place between two galaxies when the Universe was only half its current age. The astronomers enlisted the help of a galaxy-sized magnifying glass to reveal otherwise invisible detail.

These new studies of the galaxy H-ATLAS J142935.3-002836 have shown that this complex and distant object looks surprisingly like the well-known local galaxy collision, the Antennae Galaxies.

In this picture, which combines views from Hubble and the Keck-II telescope on Hawaii (using adaptive optics), you can see a foreground galaxy that is acting as the gravitational lens. The galaxy resembles how our home galaxy, the Milky Way, would appear if seen edge-on. But around this galaxy there is an almost complete ring ? the smeared out image of a star-forming galaxy merger far beyond.

Credit: NASA/ESA/ESO/W. M. Keck Observatory

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The Starry Sky under Hollow Hill

Look up in New Zealand's Hollow Hill Cave and you might think Look up in New Zealand's Hollow Hill Cave and you might think

Flight Image of the Day
All new AH-6i
2 May 2014

Fresh goods from Boeing here, a lovely shot of the production configured version of the AH-6i making its maiden flight.

AH6i 1000


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News Photos
ESA Top Multimedia
Norway relief
26 Aug 2014

This interferogram of the northern coast of Norway combines two radar images acquired by Sentinel-1A on 11 August and 23 August 2014. Although Sentinel-1A is still being commissioned, this new result demonstrates how useful it will be to map the shape of the land and monitor ground movement. Synthetic aperture radar interferometry ? or InSAR ? is a technique where two or more satellite radar images acquired over the same area are combined to detect large-scale surface changes. Small changes on the ground cause changes in the radar signal phase and lead to rainbow-coloured fringes in the interferogram. In this case, the image mainly denotes differences in topography.

The Lyngen Alps are featured on the right where mountains up to 1800 m rise from the sea. Since the area is particularly prone to landslides, it is closely monitored. Large landslides could shift rock into the sea suddenly, which could potentially create tsunami-like waves. In 1810, such a wave destroyed a village, and history shows that this kind of natural disaster occurs a couple of times every 100 years in Norway. InSAR is already an important tool for nationwide rockslide hazard mapping by Norwegian authorities. The unprecedented coverage offered by Sentinel-1 will significantly increase the value of InSAR data for this purpose.

NASACast Video
Space to Ground: Heating Up: 08/29/14
Spacesuit work, metal alloys, tracking ships and astronaut photography on this week's episode. Questions or comments? Use #spacetoground to talk to us.
29 Aug 2014

What's Up for September 2014
Red star(Antares) meets red planet(Mars) and view a zodiacal light that points towards Jupiter.
29 Aug 2014

This Week @ NASA, August 29, 2014
Space Launch System milestone, 3-D printed rocket injector test, SLS scale model test and more...
29 Aug 2014

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