Environmental protection in outer space

solar system
Credit: CC0 Public Domain

Should regulations for environmental protection be valid beyond our solar system? Currently, extra-terrestrial forms of life are only deemed worth protecting if they can be scientifically investigated. But what about the numerous, presumably lifeless planets whose oxygen atmospheres open up the possibility of settlement by terrestrial life forms? Theoretical physicist Claudius Gros from Goethe University has taken a closer look at this issue.

On Earth, has the primary goal of ensuring the availability of clean water and clean air for human beings in the future. Human interests usually take precedent when it comes to protecting more developed animals and plants. Lower life forms such as bacteria, on the other hand, are considered worthy of protection only in exceptional cases.

Claudius Gros, professor for at Goethe University, has now investigated the degree to which the norms for the protection of can be derived analogously from issues that arise in environmental protection on Earth. The international COSPAR agreements on stipulate that must ensure that any existing life—such as possible life on Jovian moon Europa—or traces of previous life forms, perhaps on Mars—are not polluted, so that they remain intact for scientific purposes. The protection of extra-terrestrial life as valuable in and of itself is not stipulated.

The COSPAR Guidelines apply to our solar system. But to which extent should they be applied to planetary systems beyond our solar system? This will become a relevant issue with the advent of launch pads for miniature interstellar space probes, such as those in development by the Breakthrough Starshot initiative. Gros argues that the protection of exoplanets for the use of humankind could not be justified. Apart from fly-bys, we could carry out scientific studies only with space probes able to slow down in an alien solar system. Using the best technology available today, this would require magnetic sails and missions lasting thousands of years, at the least.

According to Gros, the protection of exoplanets would also be irrelevant if these planets were lifeless, even if they were otherwise habitable. This probably includes planet systems such as the Trappist-1 system, whose is an M-dwarf star. Planets orbiting in the habitable zone of an M-dwarf star have a dense oxygen atmosphere that was formed through physical processes before cooling. Whether life can develop on such planets is questionable. Free oxygen acts corrosively on prebiotic reaction cycles, which are considered prerequisites for the origin of life. "Whether there is another way for life to form on these oxygen planets is an open question at this time," says Gros. "If not, we would find ourselves living in a universe in which most of the habitable planets are lifeless, and thus suitable for settlement by terrestrial life forms," he adds.

Explore further

Seeding the Milky Way with life using 'Genesis missions'

More information: Claudius Gros: Why planetary and exoplanetary protection differ: The case of long duration Genesis missions to habitable but sterile M-dwarf oxygen planets, Acta Astronautica 2019, in press. arxiv.org/abs/1901.02286

Claudius Gros: Developing Ecospheres on Transiently Habitable Planets: The Genesis Project, Astrophysics and Space Science 361, 324 (2016)
link.springer.com/article/10.1 … 07/s10509-016-2911-0

Citation: Environmental protection in outer space (2019, January 25) retrieved 20 September 2019 from https://phys.org/news/2019-01-environmental-outer-space.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Feedback to editors

User comments

Jan 25, 2019
Perhaps we are only here today because something else consciously stayed away?

Jan 27, 2019
Perhaps we are here only because some dude in his interstellar Chevy rolled down the window, spit, flicked out his cigarette butt, and beer can, as he was flyin' on by. Mebbe he stopped and took a roadside piss.

That's the more likely scenario.

Jan 28, 2019
this is our solar system unless the gov't knows otherwise and has for a long time and kept quiet about. However, be that as it may, we need to preserve what is ours if we can, no matter how much bigger it is than us. Even large things may have small weaknesses. Our first job in space is exploration, and not inside an artillery shell like those capsules that NASA proposes to use everywhere. We NEED a ship, and to get it we NEED a space based shipyard. If such requires worldwide cooperation, maybe THAT will be the agent that brings us peace. Like Ronald Reagan said: "Nothing would unite humanity more than an otherworldly threat!" Make that an otherworldly set of unknowns that once discovered would lead to progress for all.

Jan 28, 2019
But what about the numerous, presumably lifeless planets whose oxygen atmospheres open up the possibility of settlement by terrestrial life forms?

I think it's a weeee bit early to start thinking about this.

On Earth, environmental protection has the primary goal of ensuring the availability of clean water and clean air for human beings in the future.

[sarcasm]And we're doing a really great job of it [/sarcasm]. I think if we can't even keep our own house clean we shouldn't be considering what we'll do elsewhere. It'd just be hypocritical.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more