Three satellites built in Hertfordshire have been launched today to help scientists monitor our oceans.
The satellites, built by Astrium in Stevenage, have been blasted up into space from Russia.
They're made mostly of non magnetic carbon fibre so they can measure the magnetic signal of the tides.
It should provide data on how the oceans transfer heat around the Earth, a key feature of the climate.
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Britain has seen its hottest ever Halloween with temperatures breaking records for the last day of October.
A gallery of your ghoulish pumpkin creations.
It will stay mild this evening and overnight with clear spells eventually giving way to showers by the morning.