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In his January 13 tweet, Elon Musk described SpaceX progress with their Starship as "Good progress towards our "Hop in & go to Mars!" goal.

Three Raptors Fire Three Times in One Day

THE ROAD TO MAKING HUMANITY MULTIPLANETARY

WHY MARS?

At an average distance of 140 million miles, Mars is one of Earth's closest habitable neighbors. Mars is about half again as far from the Sun as Earth is, so it still has decent sunlight. It is a little cold, but we can warm it up. Its atmosphere is primarily CO2 with some nitrogen and argon and a few other trace elements, which means that we can grow plants on Mars just by compressing the atmosphere. Gravity on Mars is about 38% of that of Earth, so you would be able to lift heavy things and bound around. Furthermore, the day is remarkably close to that of Earth.

Diameter   6,791 km / 4,220 mi
Day Length   24 hrs 37 min
Force of Gravity   38% of Earth
Avg Distance from Earth   225Mkm / 140Mmi
Age   4.5 billion years

VEHICLE: STARSHIP

Starship will be the world's most powerful launch vehicle ever developed, with the ability to carry in excess of 100 metric tonnes to Earth orbit. Drawing on an extensive history of launch vehicle and engine development programs, SpaceX has been rapidly iterating on the design of Starship with orbital-flight targeted for 2020.

More on Starship

TO MARS AND BACK

Together the Starship spacecraft and Super Heavy rocket create a reusable transportation system capable of on orbit refueling and leveraging Mars' natural H2O and CO2 resources to refuel on the surface of Mars.

ON-ORBIT REFILLING

Starship leverages tanker vehicles (essentially the Starship spacecraft minus the windows) to refill the Starship spacecraft in low-Earth orbit prior to departing for Mars. Refilling on-orbit enables the transport of up to 100 tons all the way to Mars. And if the tanker ship has high reuse capability, the primary cost is that of the propellant, and the cost of oxygen and methane is extremely low.

LANDING ON MARS

Starship will enter Mars' atmosphere at 7.5 kilometers per second and decelerate aerodynamically. The vehicle's heat shield is designed to withstand multiple entries, but given that the vehicle is coming into Mars' atmosphere so hot, we still expect to see some ablation of the heat shield (similar to wear and tear on a brake pad). The engineering video below simulates the physics of Mars entry for Starship.

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THE JETSONS VS THE FLINTSTONES

"Making humanity a multi-planetary species," HooAh.

Originally published May 4, 2019

I understand "journalists" allegedly have a duty to present balanced viewpoints. On the other hand, everyone on earth seems obligated to diss-down on SpaceX and especially Tesla. I will gleefully wear their pejorative, "Fanboy," for men who love thundering rockets, hot cars and beautiful women, as the greatest of accolades if this miserable, un-American tide of recidivist doom and slander is the alternative!

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