Related topics: galaxies · dark energy · big bang · dark matter · black holes

If intelligent aliens exist, why haven't we seen them?

Thousands of planets have been discovered in the last few decades, although astronomers tell us there are probably billions. In such a large and diverse set of solar systems, it seems impossible that humans could be the only ...

From an almost perfect universe to the best of both worlds

It was 21 March 2013. The world's scientific press had either gathered in ESA's Paris headquarters or logged in online, along with a multitude of scientists around the globe, to witness the moment when ESA's Planck mission ...

Understanding the universe through neutrinos

Determining features of the elusive particle known as a neutrino – through the observation of an extremely rare nuclear process called neutrinoless double-beta decay (NDBD)—could provide a glimpse into the nature of the ...

Centenary of cosmological constant lambda

Physicists are now celebrating the 100th anniversary of the cosmological constant. On this occasion, two papers recently published in EPJ H highlight its role in modern physics and cosmology. Although the term was first introduced ...

What powers the most luminous galaxies?

Galaxy-galaxy interactions have long been known to influence galaxy evolution. They are commonplace events, and a large majority of galaxies show signs of interactions, including tidal tails or other morphological distortions. ...

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