HOUSTON -- These are photos of the blue moon over southeast Texas Friday night. If you have photos, email them to us at firstname.lastname@example.org or post them using #abc13eyewitness
A blue moon happens when there is a second full moon in any calendar month. Normally there is only one full moon per month, but this year has 13. The last time there was a blue moon was in August 2012, and the next one will be in January 2018.