Alpha Centauri Planets Discovered

Asteroseismic studies, chromospheric activity, and stellar rotation (gyrochronology) are all consistent with the Alpha Centauri system being similar in age to, or slightly older than, the Sun. Asteroseismic analyses that incorporate tight observational constraints on the stellar parameters for the Alpha Centauri stars have yielded age estimates of 4. 85±0. 5 Gyr, 5. 0±0. 5 Gyr, 5. 2 ± 1. 9 Gyr, 6. 4 Gyr, and 6. 52±0. 3 Gyr. Age estimates for the stars based on chromospheric activity (Calcium H & K emission) yield 4. 4 ± 2. 1 Gyr, whereas gyrochronology yields 5. 0±0. 3 Gyr. Stellar evolution theory implies both stars are slightly older than the Sun at 5 to 6 billion years, as derived by their mass and spectral characteristics.

How Big Is Hubble Telescope

How Big Is Hubble Telescope hubble discovers 250 tiny galaxies that existed 600 900mn Telescope Is Hubble How Big

How Big Is Hubble Telescope hubble discovers 250 tiny galaxies that existed 600 900mn Telescope Is Hubble How Big.

NASA Release date: Jan 26, 2011rrHow far does Hubble see?rrThis diagram shows how Hubble has revolutionised the study of the distant, early Universe. Before Hubble was launched, ground-based telescopes were able to observe up to a redshift of around 1, about half way back through cosmic history. Hubble’s latest instrument, Wide Field Camera 3 has identified a candidate galaxy at a redshift of 10 — around 96 per cent of the way back to the Big Bang. The forthcoming NASA/ESA/CSA James Webb Space Telescope will see further still.nnCredit: NASA, ESArrTo read more go to: http://www.nasa.gov/mission_pages/hubble/science/farthest-galaxy.htmlrr<b><a href=NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.nnFollow us on TwitternnJoin us on Facebook" class="current">.