caption: Today's Question What two factors do we need to know to determine a stars luminosity
exif: {"Image DocumentName": "Today\u2019s Question What two factors do we need to know to determine a stars luminosity", "Image ImageDescription": "How do we determine a stars size, and therefore it\u2019s luminosity", "Image XResolution": "200", "Image YResolution": "200", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}