Bursting at the seams
27-06-2016 04:58 PM CEST
europeanspaceagency posted a photo:
This NASA/ESA Hubble Space Telescope image reveals the iridescent interior of one of the most active galaxies in our local neighbourhood — NGC 1569, a small galaxy located about eleven million light-years away in the constellation of Camelopardalis (The Giraffe). This galaxy is currently a hotbed of vigorous star formation. NGC 1569 is a starburst galaxy, meaning that — as the name suggests — it is bursting at the seams with stars, and is currently producing them at a rate far higher than that observed in most other galaxies. For almost 100 million years, NGC 1569 has pumped out stars over 100 times faster than the Milky Way! As a result, this glittering galaxy is home to super star clusters, three of which are visible in this image — one of the two bright clusters is actually the superposition of two massive clusters. Each containing more than a million stars, these brilliant blue clusters reside within a large cavity of gas carved out by multiple supernovae, the energetic remnants of massive stars. In 2008, Hubble observed the galaxy’s cluttered core and sparsely populated outer fringes. By pinpointing individual red giant stars, Hubble’s Advanced Camera for Surveys enabled astronomers to calculate a new — and much more precise — estimate for NGC 1569’s distance. This revealed that the galaxy is actually one and a half times further away than previously thought, and a member of the IC 342 galaxy group. Astronomers suspect that the IC 342 cosmic congregation is responsible for the star-forming frenzy observed in NGC 1569. Gravitational interactions between this galactic group are believed to be compressing the gas within NGC 1569. As it is compressed, the gas collapses, heats up and forms new stars.
More info here: spacetelescope.org/images/potw1626a/?utm_medium=social&am…
Credit: ESA/Hubble & NASA, Aloisi, Ford
Acknowledgement: Judy Schmidt
Testing Schiaparelli’s parachute
27-06-2016 02:08 PM CEST
europeanspaceagency posted a photo:
This is a test version of the parachute that will slow the Schiaparelli entry, descent and landing module as they plummet through the martian atmosphere on 19 October.
When the module is about 11 km from the surface, descending at about 1700 km/h, the parachute will be deployed by a mortar. The parachute will slow the module to about 200 km/h by 1.2 km above the surface, at which stage it will be jettisoned.
The parachute is a ‘disc-gap-band’ type, as used for the ESA Huygens probe descent to Titan and for all NASA planetary entries so far.
The canopy, with a normal diameter of 12 m, is made from nylon fabric and the lines are made from Kevlar, a very strong synthetic material.
Tests of how the parachute will inflate at supersonic speeds were carried out with a smaller model in a supersonic wind tunnel in the NASA Glenn Research Center.
The full-scale qualification model, pictured here, was used to test the pyrotechnic mortar deployment and the strength of the parachute in the world’s largest wind tunnel, operated by the US Air Force at the National Full-Scale Aerodynamic Complex in the Ames Research Center, California.
The tower is needed to place the mortar – the horizontal tube at the top of the tower – at the centre of the wind tunnel for testing.
Schiaparelli was launched on 14 March with the Trace Gas Orbiter on a Proton rocket from the Baikonur Cosmodrome in Kazakstan.
Credit: SAF Arnold Engineering Development Complex
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