A telescope built with expertise from Cardiff University will be switched off today.
Planck has been scanning the sky to map the relic radiation from the Big Bang, the Cosmic Microwave Background or CMB.
Researchers in Cardiff built one of the telescope's instruments.
During its mission, the telescope has helped scientists to gain a better understanding of the universe and its origins, revealing the universe is older than previously thought at 13.8 billion years.
Mission controllers have fired Planck's thrusters to empty its fuel tanks. Now its on its way to a "parking" orbit around the sun.
Today its transmitters will be switched off and Planck will fall silent.
People all over Wales took to Twitter to share their excitement at having seen the Perseids meteor shower last night.
Seen quite a few meteors tonight. Such a fantastic clear night on the coast of Wales. Time for bed now #Perseid
watchin' the meteor shower in north wales outside our caravan..seen 16...come.in now.time for bed...thats a lotta wishes for me:-). n night.
The photographer, Mike Davies, said the night sky was "exceptionally clear" over Neath.
Stargazers in Wales were delighted by the "natural firework display" of the Perseids meteor shower last night.
Meteors - often known as shooting stars - appeared as a result of material falling from the tail of Comet Swift-Tuttle.
The Perseids meteor shower is an annual event, between mid-July and mid-August, but last night was expected to be particularly good, with as many as 60 meteors an hour visible to the naked eye.
Do you have a photograph of the Perseids meteor show, as seen from Wales, last night?
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Up to 60 shooting stars per hour may be seen in a 'natural firework display' tonight - and South Wales might be the best place to watch.Read the full story ›
A space telescope built with expertise from Cardiff University is coming to the end of its mission.Read the full story ›