From StarTalk.

NASA takes great care to avoid contaminating extraterrestrial environments while exploring them, using techniques like remote sensing and controlled spacecraft destruction. The potential discovery of alien life—especially macroscopic organisms—raises major scientific and ethical considerations.

From ‘Astrophysicists Discuss Issues with Gravity, Dark Matter, and the Unsolved Mystery of the Sun’s Heat’: https://youtu.be/kjFMnWjo6D4?si=wtugwSu7khTTUF34

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