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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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Freezing nights to come for Canberra

15:06 EST

Night-time temperatures will drop well below average in the Capital from Wednesday.

Warm oceans fuelling late end to big wet season

14:26 EST

Warmer-than-normal oceans have contributed to a late end to a big wet season across the southern hemisphere.

Great Barrier Reef: Making clouds brighter could help to curb coral bleaching, scientists say

14:21 EST

Marine scientists have upped the ante in their fight to save the Great Barrier Reef from the devastating effects of coral bleaching.