Exoplanets are arguably one of the most active areas of research in astronomy. Since the first were found in the 1990s, the number of known systems has ballooned beyond imagining. By the end of the second decade of the 21st century there were already thousands of detections of planets around other stars. Of course, we have only the vaguest idea what any of them look like, because they are too distant to study in detail. Most of them cannot even be seen directly - astronomers have to use scientific tricks to uncover them. But we can get some idea by looking at their calculated masses. Planets with masses similar to the Earth and likely to be rocky, while much more massive ones are most likely ice giants (such as Neptune) or gas giants (like Jupiter). Depicting these strange new worlds is a lot of fun, and I get a lot of work from astronomers who commission me to do artwork for their press releases.

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