In case you hadn't heard, a few days ago there was an astronomical event; four transits of Saturn (i.e. shadows from the moons on the cloud tops) at essentially the same time. Below is a picture, and then the link is to an animation. My question: observing time on the Hubble is valuable. They kept the 'scope focused on Saturn for How Long?
Saturn Photographed with Four Moons
Click on the link that says "transiting in front of Saturn".
Answer: more than 3 hours. But it sure doesn't happen very often, so it was probably worth it.
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