The upcoming Extremely Large Telescope (ELT) is very aptly named. When it’s completed in 2024, it will be the largest optical telescope in the world, with a mirror more than 120 feet across.

The 3-foot tall version (which is the most comparable to Aldi’s gilt mirror) is $548, measures 39.25 inches tall and 39 inches wide and is 31 lbs. It’s made with handcrafted resin, iron ...

For the Extremely Large Telescope, though, the mirror will be suspended upside down over the 128-foot (39 meter) primary mirror, which is made of 798 hexagonal mirror segments.