Scientists have found a cosmic "shortcut" to Mars

Important: this is not a finished NASA plan or an approved mission, but a computational method for finding fast interplanetary trajectories.

Details

The study was published by Marcelo de Oliveira Souza of the State University of North Rio de Janeiro in the journal Acta Astronautica. He tested whether early data on the orbit of asteroid 2001 CA21 could be used as a kind of geometric clue to find fast flights between Earth and Mars.

Usually the planning of missions to Mars depends on the mutual position of the Earth and the Red Planet. Especially important are the so-called Mars oppositions, which occur about once every 26 months when Earth and Mars are relatively close to each other.

The author of the study checked the windows of 2027, 2029 and 2031. The calculations showed that it is 2031 that gives the most interesting configuration for a fast path aligned with the plane of the early orbit of asteroid 2001 CA21.

In the extreme case, the model gave a flight to Mars in 33 days and a return in 90 days. The more "realistic" fast scenario called for 56 days there and 135 days back. That's why the popular filing came up with a figure of 153 days for the shortest calculated version of the entire mission.

The asteroid in this study is not being used as a "tug" and is not supposed to physically pull the craft to Mars. It is about something else: its early orbital geometry can help identify planes and directions of motion where fast flights become computationally feasible.

That is, the asteroid acts not as a delivery vehicle but as a navigational clue to find routes that standard planning methods may not immediately show.

Why it matters

If such approaches are confirmed and refined, they could help design faster robotic and, potentially, manned missions to Mars.

Shorter flight times are especially important for crews: the shorter the mission, the lower the total radiation exposure, the less stress on life support systems, and the easier it is to plan supplies.

But for now, it's about the early days. The study shows a method for finding potentially fast trajectories, rather than a ready-made engineering solution taking into account all the constraints of fuel, safety, ship mass and landing systems.

Background

Mars remains a prime target for future interplanetary missions. However, classic flights take months one way, and a full round trip mission can stretch for a long time due to the need to wait for a convenient mutual position of the planets.

The new study suggests expanding planning tools: using not only standard planetary windows, but also early orbital data from small solar system bodies as a filter to find faster options.

Source

A study by Marcelo de Oliveira Souza Using asteroid early orbital data for rapid mars missions is published in Acta Astronautica in 2026. The paper analysed whether the early orbital geometry of asteroid 2001 CA21 could help find fast reversible Earth-Mars-Earth routes for the 2031 window.