Tesla shares plunged Friday after the EV maker’s long-awaited robotaxi event failed to live up to investors' expectations. Monitor these important chart levels.

The chair of the EV committee at Morningstar, Seth Goldstein, says today’s stock sell-off is less about the technology than the timing, and Elon Musk’s inability to keep to a deadline. The space agency hopes its X-59 with a new design will overcome the national ban on supersonic flights over land.