Is it a dwarf planet, an asteroid or a comet?

10 December 2015

When Guiseppe Piazzi reported his observations of a minor planet in 1801, he originally thought it might be a comet. But follow-up observations by fellow astronomers suggested that Ceres was actually an asteroid. So it’s somewhat ironic that the latest results from NASA’s Dawn mission suggest this asteroid is confusingly similar to a comet. Dawn […]

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Twin civilisations? How life on an exoplanet could spread to its neighbour

3 December 2015

Imagine two nearby exoplanets orbiting the same sun, each with its own indigenous civilisation. They’re going through history either as companionable neighbours or deadly rivals. This is a familiar situation in science fiction, but could it ever happen? With the rapidly growing number of habitable exoplanets being discovered, this scenario may seem plausible. Now a […]

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NASA: streaks of salt on Mars mean flowing water, and raise new hopes of finding life

30 September 2015

Salty streaks have been discovered on Mars, which could be a sign that salt water seeps to the surface in the summers. Scientists have previously observed dark streaks (see image above) on the planet’s slopes which are thought to have resulted from seeps of water wetting surface dust. Evidence of salts left behind in these […]

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