The issue, as correctly emphasized by Carl Sagan, is the probability of the evolution of high intelligence and an electronic civilization on an inhabited world. Once we have life (and almost surely it will be very different from life on Earth), what is the probability of its developing a lineage with high intelligence? On Earth, among millions of lineages of organisms and perhaps 50 billion speciation events, only one led to high intelligence; this makes me believe in its utter improbability.

/ Ernest Mayr /

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By type:

open clusters [67]

globular clusters [14]

diffuse nebulae [3]

dark nebulae [0]

planetary nebulae [27]

variable stars [18]

binary stars [23]

asterisms [2]

galaxies [119]

quasars [1]

planets [2]

minor planets [1]

comets [5]

Sun [0]

Moon [5]

other objects [8]

By catalogue:

Messier 1-50 [20]

Messier 51-110 [18]

NGC 1-1000 [17]

NGC 1001-2000 [21]

NGC 2001-3000 [32]

NGC 3001-4000 [25]

NGC 4001-5000 [18]

NGC 5001-6000 [22]

NGC 6001-7000 [40]

NGC 7001-7840 [35]

IC 1-5386 [1]

other catalogues [71]

uncataloged [10]

[25]

By constellation:

Andromeda Antlia Apus Aquila Aquarius Ara Aries Auriga Boötes Caelum Camelopardalis Capricornus Carina Cassiopeia Centaurus Cepheus Cetus Chamaeleon Circinus Canis Major Canis Minor Cancer Columba Coma Berenices Corona Austrina Corona Borealis Crater Crux Corvus Canes Venatici Cygnus Delphinus Dorado Draco Equuleus Eridanus Fornax Gemini Grus Hercules Horologium Hydra Hydrus Indus Lacerta Leo Lepus Libra Leo Minor Lupus Lynx Lyra Mensa Microscopium Monoceros Musca Norma Octans Ophiuchus Orion Pavo Pegasus Perseus Phoenix Pictor Piscis Austrinus Pisces Puppis Pyxis Reticulum Sculptor Scorpius Scutum Serpens Sextans Sagitta Sagittarius Taurus Telescopium Triangulum Australe Triangulum Tucana Ursa Major Ursa Minor Vela Virgo Volans Vulpecula

NGC 4244 (Galaxy) Also known as: Caldwell C26 Right ascension: 12h 48m Declination: 37° 45' Constellation: Canes Venatici Date/time: 2009.05.17 21:15 UT Equipment: 12" f/5 Newtonian FoV: 33' Magnification and filter(s): 100x Seeing: 6/10 Transparency: 3/5 Location: Nádasdladány, Hungary Observer: Ferenc Lovró Description: A large edge-on spiral with intermediate brightness, highly elongated in the NNE-SSW directions near the famous double, Cor Caroli. It does not show much details like arms or dense spots, however its NNE side looks a little bit brighter and wider, which makes the entire galaxy look a bit asymmetrical. I estimate its average brightness at 12 magnitudes maximum, with an apparent size of 13' x 2'. Hi-resolution image: [ reversed sketch | original sketch ]

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