Venus in ultraviolet taken by NASA’s Pioneer-Venus Orbiter in 1979.

The annual meeting of a scientific committee called the Venus Exploration Analysis Group, or VEXAG, coincided this year with Halloween. Befitting the occasion, there were both tricks and treats for scientists studying the planet Venus.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...