![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDd9-VK27DrDwc1NRfbqSuVN0CAyhD725zIZUgFq1f8Z6le0vVMO24wgvcRjrGGsAuhDUx0xp576FCD2ufsy87t7UwgcZQ5811AJowKMQ9SPmMZJfutb7iL2Z74zIYTb2FZEpZZlPZwG4/s320/1226779381.jpg)
All of the air must be drawn out in order to put down the new layer of aluminium on the mirror's surface. It typically takes a day or so to achieve the proper vacuum.
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Palomar Skies a blog with news and information about the Palomar Observatory. Postings here will cover current research, history and public outreach events taking place at the observatory.
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