To celebrate Hinode’s 10th anniversary, this video from the Japanese Aerospace Exploration Agency (JAXA) and National Astromonical Observatory of Japan (NAOJ) features highlights captured during the satellite’s first decade in space. The Hinode mission is led by JAXA, with participation from NASA and the United Kingdom and European Space Agencies. Credit: JAXA/NAOJ
The power producing solar panels on the Sentinel-1A satellite have been damaged by an impact of some sort. The impacting object was tiny, in the few-millimetres class tiny. The image above from ESA shows the damage.
Even an impact with such a tiny object makes a difference:
A sudden small power reduction was observed in a solar array of Sentinel-1A, orbiting at 700 km altitude, at 17:07 GMT on 23 August. Slight changes in the orientation and the orbit of the satellite were also measured at the same time. — ESA
Sentinel 1A operations have not been impacted. There are in excess of 19,000 bits of known space debris, luckily this one was small.
Ever notice how spacecraft destined to stay in orbit for some period of time always seem to have reflective foil around them? Ever wonder how that could possibly work?
You’re in luck! ESA shows us the state-of-the-art in space insulation:
Blankets of multi-layer insulation (MLI) are used to cover satellite surfaces to help insulate them from orbital temperature extremes. These are the reason that satellites often look as though they’ve been covered in shiny Christmas wrapping.
MLI blankets are made up of multiple layers of very thin, metal-coated plastic film, with low-conducting ‘spacer’ material placed in-between such as silk, nylon or glass-fibre netting. Alternatively, MLI is sometimes deliberately crinkled to minimise any contact between layers.
In the airlessness of space, objects can be hot and cold at the same time, especially if one side is in sunshine and another is in shade. In such conditions, thermal radiation is the main driver of temperature change (rather than convection or conduction), and reflective MLI serves to minimise it.
Thermal control specialists aim to maintain the temperature of the satellite within set limits, to keep electronic and mechanical parts working optimally and to prevent any temperature-triggered structural distortion.
Placing MLI blankets on a satellite body is a skilled art in itself, with complex shapes needing to be created to fit around around edges or joints.
From Hubblesite: Hubble’s infrared vision pierced the dusty heart of our Milky Way galaxy to reveal more than half a million stars at its core. Except for a few blue, foreground stars, the stars are part of the Milky Way’s nuclear star cluster, the most massive and densest stellar cluster in our galaxy. Located 27,000 light-years away, this region is so packed with stars, it is equivalent to having a million suns crammed into the volume of space between us and our closest stellar neighbor, Alpha Centauri, 4.3 light-years away. At the very hub of our galaxy, this star cluster surrounds the Milky Way’s central supermassive black hole, which is about 4 million times the mass of our sun.
We are looking towards the center of our own galaxy. The center is around 27,000 light-years away and an incredible number of stars can be seen in this wonderful Hubble image taken in the infrared.
This infrared image from the NASA/ESA Hubble Space Telescope shows the centre of the Milky Way, 27 000 light-years away from Earth. Using the infrared capabilities of Hubble, astronomers were able to peer through the dust which normally obscures the view of this interesting region. At the centre of this nuclear star cluster – and also in the centre of this image – the Milky Way’s supermassive black hole is located.
Here’s a “selfie” of the little rover Opportunity and dust streaks on the solar panels. Solar panels which are otherwise remarkably clean. This rover, Opportunity has set the bar to which all future rovers will be compared at least in terms of longevity. Opportunity has been on Mars over 4300 Sols and traveled more than 42 km / 26 miles.
Make me wonder what Oppy’s twin Spirit looks like. Of course Spirit stopped functioning in 2010 after over 2500 Sols and a very successful mission. Perhaps the MRO can capture a picture of it down the road.
Here’s what NASA says about the image: This image from the navigation camera on the mast of NASA’s Mars Exploration Rover Opportunity shows streaks of dust or sand on the vehicle’s rear solar panel after a series of drives during which the rover was pointed steeply uphill.
The image was taken on March 21, 2016, during the 4,322nd Martian day, or sol, of Opportunity’s work on Mars. The rover’s location was on the north-facing slope of “Knudsen Ridge,” which forms part of the southern edge of “Marathon Valley.” During a forward, uphill drive on March 10 (Sol 4311), Opportunity’s tilt reached 32 degrees, the steepest ever for any rover on Mars. While the rover was so steeply tilted, accumulated dust on its deck was affected by vibrations from wheels slipping against the ground. Tilt in the same direction continued with two downhill drives in reverse between that ascent and when this images was taken.