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Live coverage: Falcon 9 rocket counting down to launch tonight
For the second time this year, SpaceX is preparing to launch a commercial communications satellite for Tokyo-based SKY Perfect JSAT Corp. early Sunday. A Falcon 9 rocket is set to blast off at 1:26 a.m. EDT (0526 GMT) from Cape Canaveral with the JCSAT 16 satellite to relay data and video across Japan and the Asia-Pacific. A first stage landing attempt will follow in the Atlantic Ocean a few minutes later.

LISA Pathfinder success paves way for space-based gravitational wave detection
LISA Pathfinder, a mission led by the European Space Agency with contributions from NASA, has successfully tested key technology needed to build a space-based observatory for detecting gravitational waves. These tiny ripples in the fabric of space, predicted by Albert Einstein a century ago, were first seen last year by the ground-based Laser Interferometer Gravitational-Wave Observatory (LIGO).

How to view the transit of Mercury online on 9 May
The 2016 transit of Mercury is upon us! With fine weather predicted across a large swathe of the British Isles, many will enjoy clear skies for at least some of this 7½-hour event. But if you don’t have a suitably equipped telescope, or are unable to attend any of the transit-viewing activities organised nationwide, you can still view the phenomenon online.

Where to view the transit of Mercury on 9 May
With the transit of Mercury just two days away, interest in this comparatively rare event is growing fast. Given the favourable timing of this 7½-hour phenomenon for the UK, many will be able to view it at lunchtime or after work. If you don’t have suitably equipped telescope, join one of the many transit-viewing activities hosted by astronomical organisations nationwide.

Discovery of two close-in exoplanet companions sheds new light on planet formation
Some 300 so-called hot Jupiters have been identified over the past two decades, but how did these large, hot planets ever get so close to their suns? Now scientists have made a startling discovery: One of these mysterious hot Jupiter systems has not one, but two close-in planetary companions, leading to new clues about planet formation and migration.