I recently reviewed a book about Carl Sagan’s interest in ancient aliens, written by Donald Zygutis (1). Early on in his illustrious career, Sagan expressed scepticism about seeking E.T. life using radio telescopes, instead advocating a search through historical accounts and myths to determine whether our planet had been visited (2). He argued that in a standard galaxy there are so many stars/planets etc, that all you’d need to do is point the radio receiver at any given galactic source beyond the Milky Way, and alien radio signals should come screaming out at you.
They generally don’t, of course, which led Sagan to the early logical conclusion that SETI’s search with radio telescopes was bound to fail. However, this approach became the only game in town, with serious funding at its disposal, and Sagan fell into line behind it – supporting this doomed search for E.T. radio signals ostensibly from stars within out galactic neighbourhood.
Decades on, and SETI has come up with little of any merit. The odd interesting blip, sure, but nothing demonstrably repetitive, or intelligent. Other searches have also come up empty-handed, including an extensive search for highly advanced galactic civilisations using infra-red (3), based upon the theories of the physicist Freeman Dyson. Looking for an infra-red signature from other galaxies seems like a bit of a stretch to me. Sagan’s initial premise about radio waves emanating from other distant galaxies is more plausible. By staring at the tiny amount of our sky that any given distant galaxy occupies, radio telescopes can cover a lot of possible stars in a very small space. If any of them contain radio-emitting alien species, shouting for attention, then we should pick them up one would have thought. Read More…
August 2016 saw the announcement of the discovery of an Earth-like planet orbiting our nearest neighbourhood star – the red dwarf Proxima Centauri. The official press release was preceded by a leak to the German media from within the team of astronomers. Here, I tell the story of the rumours of the announcement, and the wider implications of the discovery itself:
Rumours of an Earth-like Planet Orbiting Proxima Centauri
The German magazine Der Spiegel has reported that a major announcement is imminent: there is an Earth-like planet orbiting the red dwarf star Proxima Centauri; the Sun’s closest stellar neighbour at 4.24 light years distance.
The magazine claims that the discovery was made by the European Southern Observatory (ESO) using the La Silla Observatory’s reflecting telescope in Chile, based upon a leak from an astrophysicist who has been working with the La Silla team (1). This alleged discovery is in keeping with the current work being carried out at La Silla, as described in January earlier this year:
“What good news that the Pale Red Dot project is now planning a two-month observing campaign to search for potential Earth-analogs around Proxima Centauri using HARPS, the High Accuracy Radial velocity Planet Searcher spectrograph at the ESO La Silla 3.6m telescope. Nightly monitoring began on January 18th.” (2)