As vezes, um abraço nos conforta mais do que palavras. Um simples abraço, já se torna tudo.
—  Eduarda de Barros L.

Sometimes I have a hard day at work. On on days like that I like to cheer myself up by having some fun with an otherwise boring process.

This is a TARDIS that I patterned on silicon with electron-beam lithography. The TARDIS is 30 micrometres high (but it’s bigger on the inside) and its smallest features are the letters on “Public Call” which are only 50 nm thick. The whole thing is picked out in a metal called palladium.

On top of being a thing that makes me happy it also has a practical use. It is in fact a comprehensive dose test for my EBL process. By patterning an array of TARDISes I can check what the optimum dose of electrons is for each feature type; Areas, Lines, and Dots.

Astronomers have tracked gamma rays emanating from active galaxies called blazars (yellow ovals, right) to measure the extragalactic background light throughout the universe’s history. Even at great distances, the EBL washed out most of the gamma rays (top), suggesting that stars were already forming and spitting out photons during early eras.

Credit: Diagram: E. Otwell, Illustrattion: GSFC/NASA

via sciencenews

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