What are UFOs? What are the chances that aliens have visited the Earth? Why should we bother talking about it?
How does the vacuum interact with light? Is it possible to use light to create something from nothing? And is “birefringence” a real word?
How did the scattered disk of the solar system form? What kins of strange objects roam those badlands? And what does it do to the rest of the solar system?
What is frame dragging? How do we measure it? And how can we turn this into a method for extracting energy from rotating black holes?
Just how hard are exoplanets observations? What kind of telescope will it take to find life? And how much information can we get out of a single pixel of light?