div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imagea href=https:reader040vdocumentsmxreader040viewer2022020522575067ce1a28ab0f07ad3e1dhtml5page1jpg target=_blank img data-url=the-expanding-universe-5798b33990d70htmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: The Expanding Universe loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader040vdocumentsmxreader040viewer2022020522575067ce1a28ab0f07ad3e1dhtml5thumbnails1jpg width=140 height=200 adivp© 1933 Nature Publishing Grouppdiv