The Webb #space #telescope can't look at Mercury, Venus, Earth or the Moon because they're always on the Sunward side of it.  It also can't look at the Sun obviously.
<br /><a href='https://www.skyatnightmagazine.com/space-science/webb-earth-venus-mercury'>https://www.skyatnightmagazine.com/space-science/webb-earth-venus-mercury</a>