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Going deeper with Hubble

Astronomers are probing areas near the Hubble deep fields to test ideas about how galaxies evolved.
Sangeeta Malhotra, an astronomer at Baltimore's Space Telescope Science Institute, used the Hubble Space Telescope to carry out spectroscopy of the HubbleWhat's a grism?A grism is a prism with a series of fine grooves cut into one surface that disperses light into a spectrum. The grooves force the spectrum to emerge from the prism at an exact angle. Without these grooves, the light must be passed through a small slit for the spectrum to be measured. Hubble's ACS grism lets astronomers take spect...

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