Is Dark Energy Changing?

There is growing controversy over recent evidence suggesting that a mysterious force known as dark energy might be changing in a way that challenges our current understanding of time and space.

An analysis by a South Korean team has hinted that, rather than the Universe continuing to expand, galaxies could be pulled back together by gravity, ending in what astronomers call a "Big Crunch".

The scientists involved believe that they may be on the verge of one of the biggest discoveries in astronomy for a generation.

Other astronomers have questioned these findings, but these critics have not been able to completely dismiss the South Korean team's assertions.

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- Author: Pallab Ghosh, BBC