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X-rays

The portion of the electromagnetic spectrum that has a very short wave length. It has a wavelength longer than gamma rays, yet shorter than visible light. X-rays can penetrate various thicknesses of all solids, and when absorbed by a gas, can result in ionization.

Xenon

An inert gas that occurs at extremely low concentration in the atmosphere.

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Melbourne hits 42C before cool change as authorities defend 'heat kills' warnings

21:48 EDT

Melburnians — and the world's best tennis players — have battled through temperatures of about 42 degrees Celsius, as energy authorities curtailed some industrial users' power consumption and firefighters across Victoria stood on high alert.

Canberra braces for heatwave as temperatures expected to soar above 37C for four consecutive days

21:03 EDT

Canberrans are about to swelter through the weekend, with four consecutive days at or above 37 degrees Celsius.

Southern states swelter as power supply struggles

19:13 EDT

The power supply in Victoria and South Australia is being put to the test as five of the states and territories face an extreme heatwave, with temperatures in some areas already hitting 40 degrees Celsius.