Our 4 year old has recently become very interested in space so decided to take him here to watch one of the planetarium space shows along with our 2 other kids. Looked up the info online and found there was a space show at 6pm on Friday 12/30 of winter break. However, there wasn't an option to purchase tickets online. Called at 11am when they opened the day of the show and they said you have to come in and purchase tickets at the front desk. We arrived more than a half hour before the show and was told it was sold out. We told them we drove over a half hour to see the show and would have purchased tickets in advance but weren't given the option. They said tickets could have been reserved, but whoever we talked to several hours before never mentioned this. We asked if people didn't show up if we could purchase their seats, to which they replied that everyone had shown up. When they closed the door to the planetarium to start the show, there were 10-15 open seats minimum inside the planetarium! Very disappointed that 1) we weren't told we could reserve tickets and 2) we weren't allowed in when there was plenty of open seats! Our 4 year old was looking forward to seeing the show all day and this was just poor management by the staff! Have always enjoyed the roberson museum but this was just rediculous.