div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader042fdocumentsusreader042viewer20220411005ed84e2c6664347bbe091bbchtml5page1jpg target=_blank img data-url=documentcrabpdf-shapes-most-of-the-1500-known-plane-tary-nebulae-in-our-galaxy-lookhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: 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:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsusreader042viewer20220411005ed84e2c6664347bbe091bbchtml5thumbnails1jpg width=140 height=200 adivdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imagea href=https:reader042fdocumentsusreader042viewer20220411005ed84e2c6664347bbe091bbchtml5page2jpg target=_blank img data-url=documentcrabpdf-shapes-most-of-the-1500-known-plane-tary-nebulae-in-our-galaxy-lookhtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: 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:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader042fdocumentsusreader042viewer20220411005ed84e2c6664347bbe091bbchtml5thumbnails2jpg width=140 height=200 adivdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imagea href=https:reader042fdocumentsusreader042viewer20220411005ed84e2c6664347bbe091bbchtml5page3jpg target=_blank img data-url=documentcrabpdf-shapes-most-of-the-1500-known-plane-tary-nebulae-in-our-galaxy-lookhtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: crabpdfshapes most of the 1500 known plane- tary...