# 'Sun will vapourise Earth' (HT Tech) > The Sun’s slow expansion will cause temperature on the surface of the Earth to rise, oceans will evaporate and the atmosphere will become laden with water vapour, which is a very effective greenhouse gas, say astronomers. # 'Sun will vapourise Earth' ## The Sun’s slow expansion will cause temperature on the surface of the Earth to rise, oceans will evaporate and the atmosphere will become laden with water vapour, which is a very effective greenhouse gas, say astronomers. Feb 24 2008, 22:47 IST ![Follow on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/follow-us-facebook.png) ![Follow on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/follow-us-facebook-hover.png) ![Share](https://images.hindustantimes.com/tech/static/revamp/images/png/Share.png) ![Share](https://images.hindustantimes.com/tech/static/revamp/images/png/Shareclicked.png) ![Share on WhatsApp](https://images.hindustantimes.com/tech/static/revamp/images/png/whatsapp.png) ![Share on WhatsApp](https://images.hindustantimes.com/tech/static/revamp/images/png/whatsapp-hover.png) ![Share on Twitter](https://images.hindustantimes.com/tech/static/revamp/images/png/twitter.png) ![Share on Twitter](https://images.hindustantimes.com/tech/static/revamp/images/png/twitter-hover.png) ![Share on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/facebook.png) ![Share on Facebook](https://images.hindustantimes.com/tech/static/revamp/images/png/facebook-hover.png) ![Bookmark](https://images.hindustantimes.com/tech/static/revamp/images/png/Bookmark.png) ![Bookmarked](https://images.hindustantimes.com/tech/static/revamp/images/png/Bookmarked.png) Astronomers at the University of Sussex claim to have calculated that the Sun will vapourise Earth in about 7.6 billion years unless our planet's orbit is altered. According to them, the Sun's slow expansion will cause the temperature on the surface of the Earth to rise — oceans will evaporate and the atmosphere will become laden with water vapour, which is a very effective greenhouse gas. Eventually, the oceans will boil dry and the water vapour will escape into space. In a billion years from now the Earth will be a very hot, dry and uninhabitable ball. Also read click here. The team previously calculated that the Earth would escape ultimate destruction, although be battered and burnt to a cinder. But they did not take into account the effect of the drag caused by the outer atmosphere of the dying Sun. "We showed previously that, as the Sun expanded, it would lose mass in the form of a strong wind, much more powerful than the current solar wind. This would reduce the gravitational pull of the Sun on the Earth, allowing the Earth's orbit to move outwards, ahead of the expanding Sun. "If that were the only effect the Earth would indeed escape final destruction. However, the tenuous outer atmosphere of the Sun extends a long way beyond its visible surface, and it turns out the Earth would actually be orbiting within these very low density outer layers. "The drag caused by this low-density gas is enough to cause the Earth to drift inwards, and finally to be captured and vaporised by the Sun," astronomer Dr Robert Smith was quoted by the ScienceDaily as saying. Catch all the Latest Tech News, Mobile News, Laptop News, Gaming news, Wearables News , How To News, also keep up with us on Whatsapp channel,Twitter, Facebook, Google News, and Instagram. 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