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Light from the accretion disk around a supermassive black hole is scattered off the surrounding broad line region, causing a delayed echo at redder wavelengths. Reverberation mapping (or Echo mapping ) is an astrophysical technique for measuring the structure of the broad-line region (BLR) around a supermassive black hole at the center of an ...
The youngest of these stars are several million years old. [5] A 40-page comic and associated promotional offers about HsV and the story surrounding it were presented at the 24th Dragon Con in Atlanta on 3 September 2010, as well as first pictures of HsV from the Hubble Space Telescope. [6] [7] [8] The launch was streamed live on UStream. [8]
Two years later, Hubble showed that the relation between the distances and velocities was a positive correlation and had a slope of about 500 km/s/Mpc. [10] This correlation would come to be known as Hubble's law and would serve as the observational foundation for the expanding universe theories on which cosmology is still based.
Gyrochronology builds on a work of Andrew Skumanich, [3] who found that the average value of (v sin i) for several open clusters was inversely proportional to the square root of the cluster's age. In the expression ( v sin i ), ( v ) is the velocity on the star's equator and ( i ) is the inclination angle of the star's axis of rotation , which ...
Based on the 2013 data, the universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy. On 5 February 2015, new data was released by the Planck mission, according to which the age of the universe is 13.799 ± 0.021 billion years old and the Hubble constant was measured to be 67.74 ± 0.46 (km/s)/Mpc. [48]
NGC 3532; Observation data (J2000 epoch); Right ascension: 11 h 05 m 33 s [1]: Declination: −58° 43.8′ [1] Distance: 1,321 [2] ly (405 pc): Physical characteristics; Other designations: NGC 3532, [1] Caldwell 91, Cr 238, Mel 103, C 1104-584, Cl* 1104-584, CL 1104-584, Lacaille II.10, [3] Football Cluster, Wishing Well Cluster [4] [5] [6] [7]
For the first two years of operation TESS monitored both the southern (year 1) and northern (year 2) celestial hemispheres. During its nominal mission TESS tiles the sky in 26 separate segments, with a 27.4-day observing period per segment. [37] The first southern survey was completed in July 2019. The first northern survey finished in July 2020.