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The structure consisted of two posts that lined up with the solstices 5,000 years ago.

Delegates from Nasa and Space X were among those visiting the firm that makes specialist fabrics.

Delegates from Nasa and Space X were among those visiting the firm that makes specialist fabrics.

We spent a day out in the city with a thermal camera, recording surface temperatures indoors and outdoors.

We spent a day out in the city with a thermal camera, recording surface temperatures indoors and outdoors.

The BBC breaks down how the tech mogul's fortune has grown.

The BBC breaks down how the tech mogul's fortune has grown.

Musk is now worth $1.11tn according to the Bloomberg rich list, while SpaceX listed on the Nasdaq stock exchange with a value of $2.2tn.

Musk is now worth $1.11tn according to the Bloomberg rich list, while SpaceX listed on the Nasdaq stock exchange with a value of $2.2tn.

SpaceX founder Elon Musk said he gave the company "less than a 10% chance of succeeding at all" when it first started, and it is now going public "with the largest IPO ever".

SpaceX founder Elon Musk said he gave the company "less than a 10% chance of succeeding at all" when it first started, and it is now going public "with the largest IPO ever".

How engineers fulfilled Gaudi’s once impossible vision for the Sagrada Familia.

Climate change-induced weather events are pushing orangutan populations to extinction, says a study.

Climate change-induced weather events are pushing orangutan populations to extinction, says a study.

Global temperatures are expected to rise in the coming months as El Niño begins.

Global temperatures are expected to rise in the coming months as El Niño begins.

Global temperatures are expected to rise in the coming months as El Niño begins.

Global temperatures are expected to rise in the coming months as El Niño begins.

An El Niño event has officially started, say US scientists, raising fears of extreme weather and higher temperatures.

An El Niño event has officially started, say US scientists, raising fears of extreme weather and higher temperatures.