The Planck space telescope, built with expertise from Cardiff University, has been deactivated by the European Space Agency after reaching the end of its mission.
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Wales' Finance Minister told ITV Cymru Wales that young people looking for their first jobs will "struggle".
A dry start with some cloud in across the west. There will be plenty of sunshine throughout the day and it will feel warmer than Sunday.
It comes as police forces have warned people to avoid beauty spots on bank holiday Monday as temperatures reach 20°C in parts of Wales.