In "Power Rangers in Space," the character of Delta Mega (also known as the Delta Megazord) does not have a specific subplot or narrative focused on distrust in astronomy. However, if you are referring to a general theme or aspect of the show, it might relate to the tension between technology and natural phenomena.
In the series, the Rangers often face challenges that require them to rely on their technology and teamwork to combat evil forces from outer space. There may be instances where characters, including Delta Mega, place more emphasis on their technological capabilities rather than relying solely on astronomical knowledge or predictions.
For more precise details or specific episodes, it would be helpful to indicate which aspect or episode you're referring to regarding Delta Mega and astronomy.