From the May 2009 issue

What would our solar system look like if aliens observed it with the same telescope used to image three planets around the star HR 8799?

Mark Jonathan Davis, Studio City, California
By | Published: May 26, 2009 | Last updated on May 18, 2023
July 2009 Ask Astro 1
Three planets orbit the star HR 8799, as revealed by this infrared image. Hawaii’s Keck and Gemini North telescopes zeroed in on the young planets’ heat signatures to create the first group portrait of another solar system.
Christian Marois/National Research Council Canada

aliens could image Venus, Earth, Jupiter, and Saturn. The scientists could also track the planets’ orbits and collect spectroscopic data that would reveal Earth’s water and oxygen as well as carbon dioxide on Venus and methane on Jupiter and Saturn.