So when we detect gamma-rays from space, we know they signal intensely hot, extreme events.

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The disks transmit a signal to a server that either the space is empty or a driver has paid to park there.

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"If I did not signal clearly I was willing to make space" for others at the top, Jimenez might have left for another job, Vasella says.

FORBES: Leadership

Over 10, 000 tweets were collated, as well as videos from comedians, which will be beamed into space using a transmitter with a signal 20 times stronger than that of typical commercial radio transmitters.

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How could I signal to potential allies across the vast black reaches of interpersonal space?

NEWYORKER: Raj, Bohemian

The US space agency observatory is well suited to picking up the infrared signal expected from cold grains of dust about 10 microns (millionths of a metre) in size.

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This additional investment is a signal to Esa and commercial companies that we are going to continue to support space science and technology.

BBC: Space spending to be increased by ?60m a year

To do that, the system essentially bombards the space with an array of wireless signals and keeps watch on any changes in signal strength, building up a "picture" of the room in the process.

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The European Space Agency reported that its tracking station near Perth, Australia, received a signal from the probe this morning.

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The prototype white-space devices used in trials had little trouble sensing occupied TV channels, typically picking them up at signal strengths less than a thousandth of that needed to display an image on a TV screen.

ECONOMIST: Difference Engine