* Astronomy

Mystery of dinosaur with giant arms solved

A dinosaur mystery that has baffled palaeontologists for 50 years has finally been solved.
In the 1960s, researchers unearthed two gigantic dinosaur arms. For decades, scientists have speculated about what kind of beast they belonged to.
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'Dreadnought' dinosaur yields big bone haul

Scientists say they have 70% of the key bones needed to fully describe the creature, Dreadnoughtus schrani.
It means they can confidently estimate its great bulk - a beast that measured 26m from head to tail and weighed in at almost 60 tonnes.
Remarkably, the skeletal analysis reveals Dreadnoughtus was still growing at the time of its death.
Quite how large the dino might have become, no-one can say.
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'Bad luck' ensured that asteroid impact wiped out dinosaurs

Dinosaurs were wiped out by an asteroid impact when they were at their most vulnerable, according to a new study.
Dr Steve Brusatte, of Edinburgh University, said sea level rises and volcanic activity had made many species more susceptible to extinction.
They might have survived if the asteroid had hit the Earth a few million years later or earlier, he said, calling it "colossal bad luck".
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Dinosaurs 'neither warm nor cold blooded'

Scientists compared the growth rates of hundreds of living and extinct species, using growth rings and bone size to calculate the rates for dinosaurs.
They linked growth rate to metabolic rate, the measure of energy use that divides warm and cold blooded animals.
The study suggests that the dinosaurs fall into a middle category, in a fresh contribution to an enduring debate.
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