Sunday, 5 March 2017
Wednesday, 22 February 2017
NASA has discovered 7 Earth-like planets orbiting a star just 40 light-years away
You must have all heard about it by now!!!
The above headline is from VOX but it was on every news site you can think of.
You can even get the t-shirt, well, a poster anyway. Click below to get it...
|Artist Impression of TRAPPIST-1 system.|
Read more about ExoPlanets
Google were quick to get a new Google Doodle to celebrate!
Sunday, 5 February 2017
See The Ever Changing Universe
Looking Up At The Stars Is Time Travel - In Our Sight Time
#science #sciencemarch #education #secular
In The Milky Way
How Old Milky Way
The ages of individual stars in the Milky Way can be estimated by measuring the abundance of long-lived radioactive elements such as thorium-232 and uranium-238, then comparing the results to estimates of their original abundance, a technique called nucleocosmochronology.
These yield values of about 12.5 ± 3 billion years for CS 31082-001 and 13.8 ± 4 billion years for BD+17° 3248. Once a white dwarf star is formed, it begins to undergo radiative cooling and the surface temperature steadily drops. By measuring the temperatures of the coolest of these white dwarfs and comparing them to their expected initial temperature, an age estimate can be made.
With this technique, the age of the globular cluster M4 was estimated as 12.7 ± 0.7 billion years.
'Globular clusters are among the oldest objects in the Milky Way Galaxy...'
which thus set a lower limit on the age of the galaxy. Age estimates of the oldest of these clusters gives a best fit estimate of 12.6 billion years, and a 95% confidence upper limit of 16 billion years.
Friday, 3 February 2017
See Through This One
Hoag's Object is a non-typical galaxy of the type known as a ring galaxy. The galaxy is named after Arthur Hoag who discovered it in 1950 and identified it as either a planetary nebula or a peculiar galaxy with eight billion stars.
Sunday, 22 January 2017
Mission Cassini Huygens
The Cassini-Huygens mission is a NASA/ESA/ASI mission to explore the Saturnian system. The ESA component consists largely of the Huygens probe, which entered the atmosphere of Saturn's largest moon, Titan, and descended under parachute down to the surface.
The Cassini spacecraft is undertaking an extensive exploration of the Saturnian system with its rings and many satellites. Cassini completed its initial four-year mission to explore the Saturn System in June 2008 and the first extended mission, called the 'Cassini Equinox Mission', in September 2010.
A second extended mission, called the 'Cassini Solstice Mission' will continue until September 2017; this will allow scientists to study the Saturnian system until the summer solstice is passed in May 2017. By the time this new extension is completed the Cassini mission will have covered (since it arrived in the system) one half of a Saturnian year.
See the fact sheet - ESA Cassini - Huygens
To reach Saturn, Cassini-Huygens used a series of gravity-assist manoeuvres, with the following swing-bys:
- 27 April 1998 - Venus
- 24 June 1999 - Venuss
- 18 August 1999 - Earth
- 30 December 2000 - Jupiter
The Epic Story of Cassini Huygens
Saturday, 14 January 2017
In The Constellation of Boötes
Arcturus , also designated Alpha Boötis is a star in the constellation of Boötes. It is relatively close at 36.7 light-years from the Sun. Together with Spica and Denebola (or Regulus, depending on the source), Arcturus is part of the Spring Triangle asterism and, by extension, also of the Great Diamond along with the star Cor Caroli.
With an apparent visual magnitude of -0.05, Arcturus is the brightest star in the Northern celestial hemisphere and the fourth-brightest star in the night sky,after Sirius (-1.46 apparent magnitude), Canopus (-0.86) and Alpha Centauri (-0.27). However, Alpha Centauri is a binary star, whose unresolved components to the naked eye are both fainter than Arcturus.
This makes Arcturus the third-brightest individual star, just ahead of Alpha Centauri A, whose apparent magnitude is -0.01. The French mathematician and astronomer Jean-Baptiste Morin observed Arcturus in the daytime with a telescope (a first for any star other than the Sun and supernovae) in 1635, and Arcturus has been seen at or just before sunset with the naked eye.
Arcturus is visible from both Earth's hemispheres as it is located 19° north of the celestial equator. The star culminates at midnight on 27 April, and at 9PM on June 10 being visible during the late northern spring or the southern autumn.
From the northern hemisphere, an easy way to find Arcturus is to follow the arc of the handle of the Big Dipper (Saucepan). By continuing in this path, one can find Spica, "Arc to Arcturus, then spike to Spica".
Ptolemy described Arcturus as subrufa ("slightly red"): it has a B-V color index of +1.23, roughly midway between Pollux (B-V +1.00) and Aldebaran (B-V +1.54).
Eta Boötis, or Muphrid, is only 3.3 light-years distant from Arcturus, and would have a visual magnitude -2.5, whereas an observer on the former system would find Arcturus as bright as Venus as seen from Earth.
Wednesday, 11 January 2017
|Weird Astro Night Gif|
You are still in 2017
Just a few of my old one gifs.
|Astro Not Coley Gif|
More serious (and silly) stuff on my twitter page! Just go here.