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US and Russian communications satellites have collided in space in the first such reported mishap. A satellite owned by the US company Iridium hit a defunct Russian satellite at high speed nearly 780km over Siberia on Tuesday.


 USA Russia satellite collision space debris space junk
The submarines are equipped with sonar to detect other vessels nearby but our correspondent said it might be the case that the anti-sonar devices, meant to hide the submarines from enemies, were "too effective".


 UK Atlantic France collision nuclear submarine
Refined calculations of the asteroid Apophis's path show it is far less likely smash into Earth in 2036 than was previously thought.


 asteroid space collision Apophis
Astronomers have issued the "all-clear" about asteroid 2003 QQ47, suspected by some to be on a possible collision course with the Earth in just 11 years.


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A newly discovered asteroid designated 2009 VA, which is only about 7 meters in size, passed about 2 Earth radii (14,000 km) from the Earth's surface Nov. 6 at around 16:30 EST. ... Asteroid 2009 VA was discovered by the Catalina Sky Survey about 15 hours before the close approach, and was quickly identified by the Minor Planet Center in Cambridge MA as an object that would soon pass very close to the Earth. JPL's Near-Earth...


 asteroid collision
A huge collision expected to occur between the world's biggest iceberg and an Antarctic promontory may not happen.


 iceberg Antarctica collision
A supermassive black hole may have been observed in the process of being hurled from its parent galaxy at high speed.


 black hole astronomy galaxy collision
An object that hit Jupiter last year with a force equivalent to a few thousand nuclear bombs, which left it with a scar the size of the Pacific Ocean was probably an asteroid, say astronomers.


 Jupiter asteroid collision astronomy
A piece of debris has narrowly missed the International Space Station (ISS), forcing its six crew members to go to their escape capsules and prepare for an emergency evacuation back to Earth.


 space junk ISS debris orbit collision
For decades, scientists have been trying to understand why the near side of the Moon - the one visible from Earth - is flat and cratered while the rarely-seen far side is heavily cratered and has mountain ranges higher than 3,000m.


 Earth Moon astronomy collision mountain
NEOShield is a new international project that will assess the threat posed by Near Earth Objects (NEO) and look at the best possible solutions for dealing with a big asteroid or comet on a collision path with our planet.


 asteroid comet Earth collision trajectory
Astronomers have used the Hubble Space Telescope to work out when precisely our Milky Way Galaxy will crash into its neighbour, Andromeda.


 Milky Way Andromeda galaxy collision future gravity