As the group of so-called flat-Earthers – people who believe that our planet might actually be flat – continues to grow big, Space X boss Elon Musk started wondering if these people also believe that other planets are flat too.

After posting a beautiful image of Martian sunset on Twitter, Musk expressed his curiousness about the whole flat-Earth thing. The tech mogul, who plans to colonise the red planet, tweeted out asking "Why is there no Flat Mars Society!?"

The SpaceX CEO was talking about the Martian equivalent of the Flat Earth Society (FES), an organised community of flat-Earthers. The website of FES describes itself as "a place for free thinkers and the intellectual exchange of ideas.".

And to everyone's surprise, soon Musk's question was answered.

As amusing and ironic as this may sound, the official twitter account of Flat Earth Society got back with an utterly casual and scientific explanation saying: "Hi Elon, thanks for the question. Unlike the Earth, Mars has been observed to be round".

Over decades, thousands of observational and scientific proofs have been collected, confirming that the Earth is indeed round -- and not flat. However, the flat-Earthers believe that scientific observations of Earth's spherical shape are flawed.

Recently, astrophysicist Neil deGrasse Tyson even posted a photo showcasing how a lunar eclipse would look like if the Earth was flat.

From athletes to rappers, many people have expressed support towards the flat-Earth theory in the past. The buzz was further fanned when 'Mad' Mike Hughes – a limo driver – detailed his plan of launching himself on a homemade rocket to prove this. The lift-off was originally scheduled for November 25 but has now been delayed, pending necessary approvals to hold the launch.