It might sound like a terrifying scene from an apocalyptic science-fiction film.

But the world's space agencies have now made a rare emergency decision as the chances of Earth being hit by a 'city-killer asteroid' rise.

As the risk increases, an international team of astronomers has been granted use of the James Webb Space Telescope (JWST) to determine how much damage the asteroid would cause.

The best estimates currently suggestirm it is the asteroid istup to 90mf(300tft) wide.

That would make it around the same size of New York's Statue of Liberty or London's Big Ben.

Subway Line into Dreamland

You can see the ice crack from space.

Mt. Etna

"Green capybaras" have been spotted in the Salto Grande dam, Entre Ríos, Argentina, due to cyanobacteria in the water. Specialists warn that this poses an emerging health concern.

Cyanobacteria, microscopic organisms containing chlorophyll, give the water a greenish hue and can produce harmful toxins. Local reports indicate that some beaches have become unusable for bathers due to the contamination.