Comet PANSTARRS Just After Sunset . ... Credit Copyright: Chris Cook Explanation: Have you seen the comet? As Comet PANSTARRS fades, careful observers -- even with unaided eyes -- should still be able to find the shedding ice ball on the western horizon just after sunset. ... The comet was discovered by -- and is named for -- the Pan-STARRS astronomical sky survey that discovered it. ... Growing Gallery: Comet PanSTARRS at Sunset . ... NASA Web Site Statements, Warnings, and Disclaimers . ...