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Extending quantum communication to space environments would enable us to perform fundamental experiments on quantum physics as well as applications of quantum information at planetary and interplanetary scales. Here, we report on the first experimental study of the conditions for the implementation of the single-photon exchange between a satellite and an Earth-based station. We built an experiment that mimics a single photon source on a satellite, exploiting the telescope at the Matera Laser Ranging Observatory of the Italian Space Agency to detect the transmitted photons. Weak laser pulses, emitted by the ground-based station, are directed toward a satellite equipped with cube-corner retroreflectors. These reflect a small portion of the pulse, with an average of less-than-one photon per pulse directed to our receiver, as required for faint-pulse quantum communication. We were able to detect returns from satellite Ajisai, a low-Earth orbit geodetic satellite, whose orbit has a perigee height of 1485 km.

hello Jose! Interesting it was proposed to do the same with the ISS as part of the ACES experiment. I don't remember the paper but i can look if you're interested

U.S. scientists say they're working on mini-satellites that could function as "space cops" to help avoid collisions in space of satellites and space debris. Researchers at the Lawrence Livermore National Laboratory in California have tested a ground-based satellite to prove it is possible to refine the orbit of another satellite in low Earth orbit.

throwing empty spacesuits out of the ISS, converted into improvised satellites... now there's something I'd expect to see coming out of an ACT brainstorming session :)

Here's the video of the satellite's "launch": https://www.youtube.com/watch?v=vPx-KNTHGCA

All the satellite-related systems (except for the rocket to launch it) are DIY programs -- designed so that regular people may also have the chance of developing and eventually launching their own.

I was saying that mainly because of some flaws - the piggy-pack installation, no dedicated stage, the limited control, ... It is so far very funny, but once he can fill all the gaps, it should be an excellent initiative - although careful about the debris if anyone has its own ;p

his quote: "when art becomes practical, we call it technology; when technology becomes useless, we call it art" ... this is probably the later one ....

I am not sure the military will like this...

unfortunately the original article is subscription only "Among the evidence the article cites for this conclusion is Google's recent hiring of Brian Holtz and Dave Bettinger. Both came from companies (O3b and VT iDirect respectively) that specialize in communication satellites. Google has also invested in O3b and a current Google employee sits on company's board. A Boeing representative told The Information that Facebook and Google are "beginning to show a broader interest in satellite technology." While both companies are looking to space to broaden their reach, the ad-supported Google has the potential resources (cash) and gumption to actually follow through in the immediate future."

Innovative techniques that use satellites to monitor ocean acidification are set to revolutionize the way that scientists study the Earth's oceans. This new approach offers remote monitoring of large swathes of inaccessible ocean from satellites, including ESA's Soil Moisture and Ocean Salinity (SMOS) mission.

Hehe... as far as I know the Russians, they won't miss a chance to "clean up" a few enemy satellites too...

amateur spy-satellite spotting, a bit big article but really interesting. The budget alone of these satellites is quite impressive

While robots began assisting and replacing assembly line workers in automobile and airplane factories years ago, humans still reign supreme in satellite manufacturing. But that's slowly starting to change.

"The latest idea comes from engineers at Glasgow's University of Strathclyde who suggest that a swarm of laser-wielding satellites could nudge Earth-bound asteroids off their collision course.... One proposed deflection technique involves using lasers to pulverize the surface of the asteroid, ejecting tiny bits of rock that would act as a propellant and push it onto a different course."

Ionic fluids in thrusters for microsatellites. Here also a link to a paper on the topic: .pdf

And http://www.diyspaceexploration.com/what-are-cubesats/ Do It Yourself satellites!

Think it's a really interesting project!

There's also http://www.nanosatisfi.com started by some Austrian guy it seems

launch of satellite to collect data for improvement of ocean models, weather predictions and hurricane forecasts

".... taking at least 50kg of payload into a polar orbit with a minimum altitude of 400km (248 miles), but engineers would aim to get significant additional performance. "We'd be looking at a range from 50 to up to a maximum of 200kg because you'd want to do different sizes of satellite," said Mr Whitehorn."