I especially like the DARPA graphic showing the firmament and bouncing signals off of it back to earth.
IF politicians ever get serious about stopping illegals they will start arresting those that employ them. While shady politicians have put laws into place to protect illegals from prosecution or enacted catch/release programs, nothing has been done to stop the prosecution and asset forfeiture of companies and corporate officials for human trafficking and hiring illegals. No employers=no jobs for illegals=no illegals.