ELON Musk has a timeline of when he hopes to send humans to Mars.
The ultimate goal is for his SpaceX company to put a person on the Red Planet by 2024 and build a self-sustaining city by 2050.
SpaceX recently completed its second 'hop' test for its Starship rocket prototype.
The goal is to use Starship to take astronauts to the Moon, Mars and beyond.
During a virtual appearance last month on the , Musk said: "We've got to build the city and get to the point where it's self-sustaining.
"I want to emphasize, this is a very hard and dangerous and difficult thing.
"Not for the faint of heart. Good chance you'll die. And it's going to be tough, tough going, but it'll be pretty glorious if it works out."
To get to this Mars city goal, Musk seems to have a rough timeline set in place.
SpaceX are working on a Super Heavy rocket booster, which could be ready to test by the next Starship event which is in October.
Musk claimed via that SpaceX might be giving a progress update report in the same month.
In 2021, Musk has said Starship's first orbital flight would "probably" happen.
Musk said during the interview: "The first ones might not work.
"This is uncharted territory. Nobody's ever made a full reusable orbital rocket. Just having that at all is pretty significant."
After this, Musk wants to send Japanese billionaire Yusaku Maezawa and six to eight artists around the Moon in 2022.
Musk is aiming for Mars cargo missions by 2022 and a manned Mars mission by 2024.
The CEO previously revealed, SpaceX aims to build 1,000 Starships at a facility in South Texas over a 10-year period.
That's 100 rockets per year.
Eventually, the goal would be to launch 1,000 Starship flights to Mars every year – an average of three per day.
Each trip would see 100 passengers make their way to the Red Planet to become citizens of a Mars megacity.
Based on Musk's projections, it would take a fleet of 1,000 Starships around nine years to carry a million people to Mars.
What is SpaceX?
Here's what you need to know...
SpaceX was founded by billionaire entrepreneur Elon Musk who still has part ownership of the company with 54 per cent equity and 78 per cent voting control.
SpaceX is a private American aerospace manufacturer that is based in California.
It was founded in 2002 with the goal to build affordable rockets and enable the colonisation of Mars.
The manufacturer also aimed to reduce space transportation costs.
Since its creation, the firm has gained fame primarily as a pioneering rocket firm.
In 2008 it launched the first privately-funded liquid-propellant rocket to reach orbit and later became the first private company to launch an object into orbit around the sun.
The company has grown dramatically over its lifespan, from 160 employees in November 2005 to around 7,000 as of November 2019.
As of March 2018, SpaceX had over 100 launches on its manifest representing about $12billion (£9.24billion) in contract revenue.
Most read in Science
In other space news, the US Space Force has officially deployed its first troops.
A huge asteroid is set to make a close approach to Earth next week.
READ MORE SUN STORIES
And, Nasa has revealed an amazing snapshot of a supernova blast wave.
Do you like the sound of Elon Musk's Mars plans? Let us know in the comments...
We pay for your stories! Do you have a story for The Sun Online Tech & Science team? Email us at [email protected]