Now, they have a new primary source in hand, a historical record of molecular hydrogen gas - the stuff that makes stars. Saxton (NRAO / AUI / NSF) / ALMA (ESO / NAOJ / NRAO) / NASA / ESA HubbleĪstronomers have always been historians, looking back through time to piece together the story of the universe.
This image from the ALMA Spectroscopic Survey (ASPECS) covers one-sixth of the full Hubble Ultra Deep Field.ī. Those galaxies imaged solely by Hubble appear in blue.
ALMA has captured a gold mine of galaxies in the Hubble Ultra Deep Field: Those rich in carbon monoxide gas (which traces molecular hydrogen) have lots of star-forming potential (colored orange).
