Spaceships: Life Support and Camping Out
V. Oxygen is the third most abundant element in the universe, following #hydrogen and #helium.
W. It makes up approximately 0.9% of the total mass of the cosmos. While this may seem like a small percentage, it is actually quite significant considering the vastness of the universe.
X. Oxygen is primarily produced through photosynthesis, a process carried out by plants, algae, and some bacteria. During photosynthesis, these organisms convert carbon dioxide and sunlight into oxygen and glucose.
Y. While oxygen is present in space, it is not freely available in its molecular form. Instead, it is often found combined with other elements, such as carbon and hydrogen, in compounds like water and carbon dioxide.
Z. Despite decades of astronomy, molecular oxygen (the stuff you can breathe, comprising two atoms, O2, joined together) is almost nonexistent. As Science.org notes, in space, hydrogen molecules, H2, outnumber O2 by a million to one.