Britain is set to get its first spaceport with eight sites being considered - six of which are in Scotland.
The aim is to use the port to launch tourists into space as well as commercial satellites.
Here are the eight candidate sites:
Stornoway airport is on the Isle of Lewis, in the Outer Hebrides of Scotland. It provides access to the Western Isles, with flights from Inverness, Edinburgh, Aberdeen and Glasgow as well as inter-Island services.
Approximately 130,000 passengers pass through the terminal each year.
Kinloss Barracks was called RAF Kinloss but it was officially handed over to the army in July 2012.
Kinloss is on the Moray Coast in Scotland, about three miles from the small town of Forres and 27 miles from Inverness.
RAF Lossiemouth is just west of the town of Lossiemouth in Moray, Scotland. The base is one of the largest and busiest fast-jet bases in the Royal Air Force.
RAF Leuchars is the second most northernly air defence station in the UK. It is in Leuchars, Fife on the east coast of Scotland close to the university town of St Andrews.
The station is mainly responsible for providing crews and aircraft to police UK airspace.
Glasgow Prestwick Airport is Glasgow's second airport located about one mile from Prestwick in South Ayrshire, Scotland. It has one terminal which flies 1.9 million passengers each year and is home to four airlines.
Campbeltown airport is on the western side of the Kintyre peninsula in Scotland approximately three miles west of Campbeltown.
The Runway is 3,049 meters long, the longest of any public airport in Scotland.
Llanbedr airport is in the Snowdonia National Park near the village of Llanbedrnear, North Wales. It is the only site in Wales to be shortlisted as a spaceport.
Newquay Cornwall Airport, located between Newquay and Wadebridge, is the main commercial airport for Cornwall. Flights from the airport go to destinations including Edinburgh, Paris and Zurich.