early universe

Ancient Galaxy Megamergers - ALMA and APEX discover massive conglomerations of forming galaxies in early Universe

Ancient Galaxy Megamergers - ALMA and APEX discover massive conglomerations of forming galaxies in early Universe

The ALMA and APEX telescopes have peered deep into space — back to the time when the Universe was one tenth of its current age — and witnessed the beginnings of gargantuan cosmic pileups: the impending collisions of young, starburst galaxies.

Lack of ‘dark matter’ in early galaxies perplexes astronomers

Lack of ‘dark matter’ in early galaxies perplexes astronomers

It may seem like we’ve got the universe pretty much figured out. We have a relatively good idea about how it started and how it is evolving. We’ve sent probes to neighbouring planets, discovered an increasing number of exoplanets and are cataloguing the family tree of galaxies.

Dark Matter Less Influential in Galaxies in Early Universe

Dark Matter Less Influential in Galaxies in Early Universe

New observations indicate that massive, star-forming galaxies during the peak epoch of galaxy formation, 10 billion years ago, were dominated by baryonic or “normal” matter. This is in stark contrast to present-day galaxies, where the effects of mysterious dark matter seem to be much greater. This surprising result was obtained using ESO’s Very Large Telescope and suggests that dark matter was less influential in the early Universe than it is today. The research is presented in four papers, one of which will be published in the journal Nature this week.

Deepest ever millimetre observations of early Universe

Deepest ever millimetre observations of early Universe

International teams of astronomers have used the Atacama Large Millimeter/submillimeter Array (ALMA) to explore the distant corner of the Universe first revealed in the iconic images of the Hubble Ultra Deep Field (HUDF). These new ALMA observations are significantly deeper and sharper than previous surveys at millimetre wavelengths. They clearly show how the rate of star formation in young galaxies is closely related to their total mass in stars. They also trace the previously unknown abundance of star-forming gas at different points in time, providing new insights into the “Golden Age” of galaxy formation approximately 10 billion years ago.

Hubble finds Universe may be expanding faster than expected

Hubble finds Universe may be expanding faster than expected

Astronomers have used Hubble to measure the distances to stars in nineteen galaxies more accurately than previously possible. They found that the Universe is currently expanding faster than the rate derived from measurements of the Universe shortly after the Big Bang. If confirmed, this apparent inconsistency may be an important clue to understanding three of the Universe’s most elusive components: dark matter, dark energy and neutrinos.

The Turbulent Birth of a Quasar - ALMA reveals secrets of most luminous known galaxy in Universe

The Turbulent Birth of a Quasar - ALMA reveals secrets of most luminous known galaxy in Universe

The most luminous galaxy known in the Universe — the quasar W2246-0526, seen when the Universe was less than 10% of its current age — is so turbulent that it is in the process of ejecting its entire supply of star-forming gas, according to new observations with the Atacama Large Millimeter/submillimeter Array (ALMA).