![SA Space & Physics Vol 3 Issue 5](https://static.scientificamerican.com/sciam/cache/file/9D9A6B60-C32C-40C8-A1081BFFC31B7D92_source.jpg?w=300)
Volume 3, Issue 5
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Features
NASA Has Launched the Most Ambitious Mars Rover Ever Built: Here's What Happens Next
Perseverance will stow away rocks for eventual delivery to Earth and will listen for Martian sounds for the first time
How Many Aliens Are in the Milky Way? Astronomers Turn to Statistics for Answers
The tenets of Thomas Bayes, an 18th-century statistician and minister, underpin the latest estimates of the prevalence of extraterrestrial life
This Twist on Schrödinger's Cat Paradox Has Major Implications for Quantum Theory
A laboratory demonstration of the classic “Wigner’s friend” thought experiment could overturn cherished assumptions about reality