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galaxy look un- assumingly starlike In fact planetary nebulae are usually identified as such by their emission-line loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220411005ed84e2c6664347bbe091bbchtml5thumbnails3jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220411005ed84e2c6664347bbe091bbchtml5page4jpg target=_blank img data-url=crabpdf-shapes-most-of-the-1500-known-plane-tary-nebulae-in-our-galaxy-lookhtmlpage=4 data-page=4 class=ts-thumb lazyload alt=Page 4: crabpdfshapes most of the 1500 known plane- tary nebulae in our galaxy look un- assumingly starlike In fact planetary nebulae are usually identified as such by their emission-line loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader042vdocumentssitereader042viewer20220411005ed84e2c6664347bbe091bbchtml5thumbnails4jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=5Page 5button div class=ts-imagea href=https:reader042vdocumentssitereader042viewer20220411005ed84e2c6664347bbe091bbchtml5page5jpg target=_blank img data-url=crabpdf-shapes-most-of-the-1500-known-plane-tary-nebulae-in-our-galaxy-lookhtmlpage=5 data-page=5 class=ts-thumb lazyload alt=Page 5: crabpdfshapes most of the 1500 known plane- tary nebulae in our galaxy look un- assumingly starlike In fact planetary nebulae are usually identified as such by their emission-line loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC 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