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Martian landscape.

SpaceX is on its way to building its spaceship to Mars, and founder and CEO Elon Musk is using social media to tease parts of its development.

Musk posted a picture to Instagram on Sunday that shows a massive cylindrical structure he refers to as the “main body tool for the BFR interplanetary spaceship.” The structure is on props over a Tesla vehicle, dwarfing it by many times.

The BFR – short for “Big Falcon Rocket” in mixed company, reportedly another acronym a bit more ribald in some circles – is the main centerpiece of Musk’s vision for travel to Mars. Over the last two years, he has talked and written about the need to improve cost efficiencies in order to start colonizing the red planet.

Last month, Musk told a crowd at the SXSW Conference in Austin that the first prototype BFR spaceship was in development. He has previously said that the component will be 157.5 feet long, with a 30-foot diameter, as reported by Space.com.

The BFR main body tool is expected to transport 100 or more passengers, according to Musk’s previous talks. The rocket to bring the craft to Earth's orbit will require more than 30 Raptor engines. Together, the rocket and body of the rocket are expected to be 348 feet tall when stacked, according to reports.

The BFR is the biggest rocket yet planned in history. Musk has also said that its scale and reusability means it will eventually replace the company’s fleet of other, smaller rockets, including the Falcon 9, the Falcon Heavy, and the Dragon.

Musk said in 2016 he planned to launch a manned mission to Mars in 2024. But last summer, he outlined the need to improve efficiency 5 million percent, in plans published in the journal New Space.

“If things go super well, it might be in the 10-year timeframe, but I do not want to say that is when it will occur,” Musk wrote at the time. “There is a huge amount of risk. It is going to cost a lot. There is a good chance we will not succeed, but we are going to do our best and try to make as much progress as possible.”

The company has overcome some adversity in recent years, with scrubbed missions and explosions and other setbacks. SpaceX’s concept of recycling rockets to make space cheaper to access was finally realized last March, when they successfully launched a Falcon 9 rocket that deployed a commercial communications satellite in 32 minutes – with the first stage of the rocket successfully landed on a droneship in the Atlantic Ocean.

Screenshot of Elon Musk's Instagram photo showing the main body tool for the BFR interplanetary spaceship. Photo: Elon Musk/Instagram
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