Giuseppe Luigi Lagrange (25 January 1736 – 10 April 1813), was an Italian mathematician and astronomer. He discovered that there are five locations around Earth where the gravitational forces and the orbital motion of a spacecraft, Sun and Earth interact to create a stable location. The Lagrangian Points, as they are named, are natural parking places in space. It has been suggested that we can place a space telescope or build a human space colony over there. But there is much more we can do there: protect Earth from solar storms, help reducing the use of fossil fuel, and ‘alleviate’ the logistics of human exploration of Mars.

Sometimes serendipity just comes to you in an “aha moment”.  The following 3-prong idea leverages the possible advantages that could come from creating new infrastructure at the L-1 Lagrangian point in space.  Here we can create new infrastructure to save and also power our planet and as a bonus find a better way to go to Mars. Not a bad—in fact may be a great 3-in-l solution. L-1 can indeed be a lower cost and safer way to Mars, an excellent location for a solar power satellite, and viable way to create a solar shield for Earth. This will be essential when the natural shielding from the Van Allen Belts is greatly diminished as the world’s magnetic poles flip. The answer advocated here is what I called STAMPSS (STaging Area to Mars and Protective Solar Screen).


The L1 Lagrangean Point (or alternatively known as a libration point) is a somewhat steady-state location where the conflicting gravitational pulls of the Sun, Earth and the Moon cancel one another and create a relatively fixed  space location. This unique point, that is 1.5 million kilometers from Earth (or about 1 million miles), provides a position that is always intermediary between the Earth and the Sun because their mutual gravitational distortion of the time-space continuum creates a what might be called a “gravitational valley” at this location is shown in the graphic below. In terms of propulsive force this also represents a very low thrust location from which to reach Mars, the Moon, asteroids or other planets.

A contour plot of the effective potential due to gravity and the centrifugal force of a two-body system in a rotating frame of reference. credits: wikipedia

Langragian points: a contour plot of the effective potential due to gravity and the centrifugal force of a two-body system in a rotating frame of reference. credits: Wikipedia

The L-1 Point can act as the Staging Area for Missions to Mars and Creation of the “Solar Shield” for Earth. This is the most suitable place in space to locate at least three facilities:

First, a way station from which high efficiency and low cost electric ion propulsions transport systems could go to Mars and other locations. Conventional chemical propulsion can easily reach this location. A Falcon 9 launch, for instance, launched the DSCOVR satellite to this location quite recently. Much more cost effective and fuel efficient electric ion propulsion can then undertake a mission to Mars from this location with maximum efficiency.

Second, create a solar shield mechanism that can screen out the most energetic solar storms in the form of coronal mass ejections that could wipe out a significant number of electrical power grids, application satellites and other electronic devices that might be destroyed or incapacitated by coronal mass ejections (CMEs). Lloyds of London has done a study that estimates that the damage from a solar storm like the Carrington Event of 1859 could do up to $2.6 trillion dollars of damage. The shift of the magnetic poles of Earth (i.e. the North Pole has now moved to a location in Siberia), is reducing the ability of the Van Allen Belts to protect us against solar storms The recently launched ESA Swarm satellite measurements indicate this problem is quite real. The illustration below shows computer modeling that suggest Earth’s protective shielding will, in a few decades , may be only be 15% as efficient as it was just 20 years ago. This Solar Shield for Earth could also assist to defer the effects of climate change as well.

Third, deploy a solar power satellite system that could beam clean energy back to Earth 24 hours a day. This can be increased in size and efficiency over time and eventually pay for the way station and the solar shield.

Magnetic pole reversals. credits:

We can do all this with technology that is at hand or is achievable within 5-10 years. So why not do it?

About the author

Joe Pelton

Joe Pelton

Joseph N. Pelton, PhD, is the former Dean of the International Space University, and Executive Board, International Association for the Advancement of Space Safety (IAASS)

  • Αθανάσιος Στάβερης-Πολυκαλάς

    Very interesting article Dr. Pelton. especially the note regarding protecting Earth, intrigues me. I am part of scientific team in Greece, which effort is to promote a solution a shield against super solar storms that can protect Earth effectivelly (over 99 %) of solar charged particles. Let me know if you are interested to listen to it.
    Athanassios Staveris-Polykalas, phD particle physics

    • From Joe Pelton: I am happy to learn that there are people addressing this elsewhere. I am happy to learn more. I am leaving for Australia soon. Please send more information in next 3 days if possible. Thanks. Joe Pelton

      • Αθανάσιος Στάβερης-Πολυκαλάς

        We are a
        group of independent
        scientists that we are
        studying the implications that might have super solar flares on our civilization.
        We came to the understanding that a second Carrington event, would be
        devastating, since no government is prepared for the consequences. Here we have
        started a campaign informing citizens, (soon we will have our own national radio
        show). To make the long story short, we
        propose a global cooperation of nations in order to shield Earth from super
        solar storms by building plasma shields in space, the Lagrangian points especially L1 are the best candidates. A plasma shield, could change the course of
        highly energetic charged particles that consist the plasma arriving from the
        Sun. Electrons can be easily diverted, but protons are much harder, a plasma barrier
        will do the job. Preliminary studies prove that it can be achieved a more than
        90 % diversion of protons with energies more than 100 MeV. Building such a
        plasma shield, is a huge project, but necessary if we want to protect our way
        of lives. As mentioned by NASA, there is a 12 % to have another Carrington like
        event in 10 years, 50 % in 100 years, 100 % in 250 years. These odds are not
        good, it much more likely to be hit by such a solar flare than any other catastrophic

        Kind Regards,