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" ... Dan: You have had so much meaningful engagement in global foreign policy, international affairs, and domestic concerns, including the idea of citizenship. As you have orbited these stars all at once, have you ever had to make a choice about where to direct your energies? ... "
" ... For instance, foreign interests have orbited 15 synthetic-aperture radar satellites capable of seeing through clouds to collect detailed geospatial intelligence for commercial purposes. Only one such satellite is operated by U.S. industry. ... "
" ... The puzzle is this: when a Sun-like star goes down the path towards becoming a white dwarf, it’s expected to destroy much of the solar system that has historically orbited it. ... "
" ... When Newton came along, his conception of gravity was radically revolutionary. People had previously measured how objects accelerated near the surface of Earth, with the distance they fell increasing in proportion to the time they were falling squared. Kepler had revolutionized astronomy by demonstrating that planets orbited the Sun in an elliptical orbit. And Halley, a contemporary of Newton, had begun to understand the periodic nature of comets. ... "
" ... When you observe a star over time, if it’s being orbited by a massive companion, that star is going to periodically appear to move towards you, then away from you, then towards you, etc., as the companion completes orbit after orbit. If there are multiple planets, then multiple signals will be superimposed atop one another. Stellar wobble, the original term, has fallen out of fashion, as we now refer to it as the “radial velocity” method. Only when our spectroscopic capabilities became precise enough — where we break light up into individual wavelengths to look for particular elements and absorption/emission features — were we able to discover planets through these methods. ... "