Does the Church have an opinion on colonizing Mars? How ethical is the ambition for human beings to live not on earth?

• Deb in Quincy

The Catholic Church has issued no definitive teaching on planetary colonization, but its Tradition — rooted in Scripture, moral theology, and papal reflections — offers principles to guide discernment on this question. Colonizing the Moon, Mars, or another planet is not inherently immoral, but it carries serious moral responsibilities. Any such endeavor must be pursued in accord with God’s plan for humanity and creation.

Some key moral principles that must guide space colonization include:

• Stewardship, not exploitation;
• Service to humanity, not profit or pride;
• Respect for life and creation, known or unknown;
• Integral human dignity, both on Earth and beyond;
• Faith in God’s providence, not human autonomy.

The Second Vatican Council affirmed man’s God-given role in creation:

“Through science and technology, [man] has extended his mastery over nearly the whole of nature… . This human activity accords with God’s will. For man, created to God’s image, received a mandate to subject to himself the earth and all it contains … .” (Gaudium et Spes, 33-34).

It is reasonable to extend this biblical principle of stewardship to include other parts of creation beyond Earth. God entrusted humanity with creation and gave us the freedom to use its resources in ways that promote human flourishing. As St. Ignatius of Loyola wrote in his Spiritual Exercises: “Man is created to praise, reverence, and serve God our Lord … . The other things on the face of the earth are created for man to help him in attaining the end for which he is created.”

Some modern ideologies, however, wrongly prioritize the planet or animal life above human beings. Efforts to reduce or limit human population for the sake of “saving the planet” distort the proper order of creation. As St. Paul said of the pagans, they “exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator” (Rom 1:25).

Even a non-religious person like Elon Musk, founder and CEO of SpaceX, recognizes the unique value of human consciousness. His push to colonize Mars is rooted in the desire to preserve the human race and maximize its potential. He sees Mars both as a catalyst for an expanding, multiplanetary civilization and as insurance for human survival in case of catastrophe on Earth. While the genius and financial investment of people like Musk can be a welcome contribution in resolving major issues, it is always necessary for the ambitions of science to be guided by the truths of the Faith. What is technologically possible is not always morally justified.

The Compendium of the Social Doctrine of the Church affirms:

“Scientific and technological progress, which contemporary man is continually expanding in his dominion over nature, must be oriented to the development of the whole person and of all people. Science and technology are ordered to man … hence they find in the person and in his moral values both their point of departure and their goal” (n. 464).

Creation is for our use, but it is not our possession. We must exercise stewardship with gratitude, humility, and restraint. The fact that God entrusted creation to us as part of His plan for our salvation makes creation more meaningful and worthy of our respect — not less. 

Respect for creation includes thinking not only of the present generation, but of future generations. If, despite our best efforts, Earth becomes unable to sustain life, then attempting to colonize another planet could be a legitimate and even necessary act of stewardship. There is no divine command that binds humanity to remain on Earth forever, especially in the face of extinction-level threats.

Just as oceanic voyages once seemed daunting, so now does space colonization. But if done for just and wise reasons, such exploration could be part of God’s providential plan for humanity.

From a Catholic perspective, space exploration and colonization efforts must not distract from urgent needs on Earth. Global poverty, injustice, and environmental degradation cannot be ignored. We cannot treat Mars as a backup plan that excuses us from our responsibility to care for this planet, which is clearly the primary home that God has given humanity.

Should human survival require settlement elsewhere, that opportunity must be extended as much as possible to everyone. It should not be reserved for a wealthy elite, nor controlled by a single nation or corporation. Colonization would have to uphold human dignity, ensuring the ethical treatment of settlers, access to community and the sacraments, safeguards for marriage and family, and protection against dehumanizing technology.

The Church does not fear space. Creation is a gift, and humanity’s exploration of it can reflect God’s unfolding providence. The possible colonization of Mars should not be seen as a conquest, but a new frontier approached with humility, solidarity, and awe — guided by truth, love, and justice. 

“When I see your heavens, the work of your fingers, the moon and stars that you set in place — What is man that you are mindful of him, and a son of man that you care for him? Yet you have made him little less than a god, crowned him with glory and honor. 

You have given him rule over the works of your hands, put all things at his feet” (Ps 8:4-7).

Father Christopher Trummer, S.T.L, is parochial vicar at St. Boniface Parish in Edwardsville, associate delegate for Health Care Professionals, associate chaplain of the Springfield Chapter of the Catholic Physicians Guild/Catholic Medical Association and has a license in Sacred Theology in Moral Theology at the Pontifical University of the Holy Cross in Rome, Italy.