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Current issue

ELEKTRO 6/2019 was released on June 6th 2019. Its digital version will be available on June 24th 2019.

Topic: Rotating electrical machines, drives and power electronics; Electromobility

Main Article
Hybrid drive of shunting locomotive

SVĚTLO (Light) 3/2019 was released on June 11th 2019. Its digital version will be available on July 17th 2019.

Fairs and exhibitions
Euroluce 2019 by designers eyes
Exhibition Light in architecture 2019
Amper 2019 in capture of sophisticated technologies

Refreshing our memory
Lighting glass from Kamenný pahorek

SpaceX launches first 60 satellites of its internet network

24.05.2019 | Phys.org | www.phys.org

SpaceX launched a rocket carrying the first 60 satellites of its "Starlink" constellation, which is intended to provide internet from space and could one day number 12,000 satellites.

One of the company's Falcon 9 rockets blasted off without incident from Cape Canaveral in Florida around 10:30 pm (0230 GMT). An hour later, the rocket began to release the satellites at an altitude of 280 miles (450 kilometers). The satellites then had to separate and use their thrusters to take up their positions in a relatively low orbit of 340 miles (550 kilometers).

SpaceX satellites

That is slightly higher than the International Space Station, but well below the majority of terrestrial satellites, the highest of which sit in a geostationary orbit of 22,400 miles (36,000 kilometers). Each of the satellites weighs just 227 kilograms (500 pounds) and was built in-house in Redmond, near Seattle. Starlink will become operational once 800 satellites have been activated, which will require a dozen more launches.

Read more at Phys.org

Image Credit: SpaceX

-jk-