RENEE MONTAGNE, HOST:
Good morning. I'm Renee Montagne. Caltech astronomer Mike Brown helped prove Pluto is not a true planet. Brown tweets under the handle plutokiller. But his young daughter does not approve. She wanted Pluto to stay a planet, and she said she wouldn't forgive him until he discovered a brand new one. Now he thinks he has. Brown and another astronomer say small bodies appear to be orbiting a giant icy planet far beyond Pluto called Planet Nine. Thanks, Dad. It's MORNING EDITION.
NPR transcripts are created on a rush deadline by Verb8tm, Inc., an NPR contractor, and produced using a proprietary transcription process developed with NPR. This text may not be in its final form and may be updated or revised in the future. Accuracy and availability may vary. The authoritative record of NPR’s programming is the audio record.