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Input user-selected values of the Hubble constant, Omega(matter), Omega(vacuum) and redshift, returns the current age of the Universe, the age, the co-moving radial distance (and volume) and the angular-size distance at the specified redshift, as well as the scale (kpc/arcsec) and the luminosity distance.
The Theoretical Astrophysical Observatory (TAO) houses queryable data from multiple popular cosmological simulations and galaxy formation models.
Calculate how much your data varies within some volume at a particular redshift. Returns an empirically estimated cosmic variance based on the functional form presented in Driver & Robotham (2010).
Halo Mass Function
Calculate the mass distribution of dark matter halos. Allows for a choice of fitting function.
Tool for OPerations on Catalogues And Tables: an interactive graphical viewer and editor for tabular data. Provide most of the facilities that astronomers need for analysis and manipulation of source catalogues and other tables, though it can be used for non-astronomical data as well.
A shameless plug for my own astronomical almanac, which contains useful fundamental constants and conversions, as well as some basic equations. There is also a tab of common spectral features, as well as a list of telescopes and key astronomical surveys by waveband.
The NASA/IPAC Extragalactic Database (NED) provides a multi-wavelength fusion of data for millions of objects outside the Milky Way galaxy. Objects can be queried By Name, Near Name or Near Position (cone search).
The VizieR Catalogue Service. Additional tools for sed plotting, ADQL querying and CDS cross-matching between two tables.
Query the SIMBAD database by identifier, coordinates, bibcode, physical criteria or object lists.
SMOKA provides public science data obtained at Subaru Telescope, 188cm telescope at Okayama Astrophysical Observatory, 105cm Schmidt telescope at Kiso Observatory (University of Tokyo), MITSuME, and KANATA Telescope at Higashi-Hiroshima Observatory.
Canadian Astronomy Data Centre, including the CFHT legacy survey.
Archival data from the ESO telescopes, including the UKIRT Infrared Deep Sky Survey (UKIDSS).
Archive of NASA's infrared & submillimeter data.
Data release 2, provides updated spectra & redshifts for GAMA I.
The National Radio Astronomy Observatory.
The Atacama Large Millimeter/submillimeter Array.
The X-ray Multi-Mirror Mission (XMM-Newton) data archive.
The Chandra X-ray Observatory data archive (CDA).
Data Release 10 (DR10) offers the latest data from the Sloan Digital Sky Survey.
The SAO/NASA Astrophysics Data System (ADS) maintains three bibliographic databases containing more than 10.8 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints.
Open access to almost a million electronic pre-prints in physics, mathematics and computer sciences.
AAS job register
Current AAS jobs register ads.
CADC conference lists
List international astronomy meetings up to two years in advance.
Jobs rumour mill
Astrophysics postdoc and faculty job offer rumours.
Tips and Tricks for Professional Astronomers, including mac computing, email management, paper organization, iPhone apps etc.
Phil Plait's blog on all things astrophysically interesting.
Theoretical astrophysicist Peter Coles's blog (Peter Coles is an anagram of telescoper!).
Observational cosmologist Andy Lawrence's blog.
Astrophysicist Amanda Bauer's blog
Astrophysicist Karen Master's blog. "Poets say science takes away from the beauty of the stars - mere globs of gas atoms. I too can see the stars on a desert night, and feel them. But do I see less or more? - Feynman"
Andrew Jaffe's blog, an astrophysicist at Imperial College London.
One Small Step
Astrophysicist Sarah Kendrew's blog.
I love science
A site dedicated to interesting and current science stories presented in an amusing and accesible fashion.
A webcomic of romance, sarcasm, math and language.
An awesome site self-described as "Serious Scientific Answers to Absurd Hypothetical Questions".
The Zooniverse is home to the internet's largest, most popular and most successful citizen science projects. Originating in 2007 with Galaxy Zoo, Zooniverse has grown to over a million people worldwide participating in a range of scientific projects.
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.