21:22 Moana Maniapoto gets a standing ovation as she was inducted into the NZ Music Hall of Fame at the APRA Silver Scroll Awards tonight.

17:38 The jury deciding on the lawsuit against former Conservative Party leader Colin Craig has not reached a decision in its first day of deliberations.

17:06 Liam Squire has been preferred to Elliot Dixon as Jerome Kaino's blindside replacement, for Sunday's All Blacks Test against the Pumas.

16:12 New Zealand's use of renewable energy reached a record 40.1% of total primary supply last year. That makes us the third best in the world.

16:10 The US is preparing to suspend talks with Russia on Syria unless Moscow takes immediate steps to end the assault on Aleppo.

Fri, 13 Apr 2012

VIDEO: Why don't those stars move?

Stars in the sky will typically appear to rise and set as the Earth turns. If you look closely at the above time-lapse movie, however, there are points of light that appear stationary. These objects are not stars but human-launched robotic spacecraft that remain fixed high above the Earth's equator. Called geostationary satellites, they don't fall down because they do orbit the Earth -- they just orbit at exactly the same speed that the Earth rotates. The orbital distance where this is possible is much farther than the International Space Station but much closer than the Moon. The video was taken from one of the highest revolving restaurants in the world located on the Mittelallalin in the Swiss Alps. An even closer inspection will show that the geostationary satellites flash with glints of reflected sunlight. The satellites also all appear on a single line - actually the projection of the Earth's equator onto the sky.

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