Saturday, 14 January 2017

Arcturus

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.

Arcturus



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

night sky astro nebula art fly

surreal coleyastro mix of mashed images in Gif format
Weird Astro Night Gif

Old Windows 95 Style Gifs And Image Edits Are In This Lot

You are still in 2017

Just a few of my old one gifs.


Naked Eye Dark Sky Gif
Astro Not Coley Gif






More serious (and silly) stuff on my twitter page! Just go here.




My Twitter Favicon image.
On Twitter


Wednesday, 28 December 2016

Original Christmas Spirit

The Meaning of Christmas Was This Blog's First Post

I did my first ever blog posts here about ten years ago, in tech terms feels like 20 years ago.

Twenty years is hard to chew.




Worthy Xmas via Darwin?

Humanist Celebrations are christmas worthy too.

Like anyone cares about a 'meaning'.












It Was Christmas 2008

Saturday, 3 December 2016

Mutations in biology

Short Excerpt


In biology, a mutation is a permanent alteration of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements. Mutations result from damage to DNA which is not repaired, errors in the process of replication, or from the insertion or deletion of segments of DNA by mobile genetic elements.

   Mutations may or may not produce discernible changes in the observable characteristics (phenotype) of an organism. Mutations play a part in both normal and abnormal biological processes including: evolution, cancer, and the development of the immune system, including junctional diversity.

  Mutation can result in many different types of change in sequences. Mutations in genes can either have no effect, alter the product of a gene, or prevent the gene from functioning properly or completely. Mutations can also occur in nongenic regions.

  One study on genetic variations between different species of Drosophila suggests that, if a mutation changes a protein produced by a gene, the result is likely to be harmful, with an estimated 70 percent of amino acid polymorphisms that have damaging effects, and the remainder being either neutral or marginally beneficial. Due to the damaging effects that mutations can have on genes, organisms have mechanisms such as DNA repair to prevent or correct mutations by reverting the mutated sequence back to its original state.

Source

Charles Darwin by Julia Margaret Cameron





Saturday, 15 October 2016

Another Astronomy Note

If Not Viewing With a Telescope or Binoculars - See this Constellation


Orion




In the night sky in the northern hemisphere...









This Is An Orbital Weekend

Evolution



Is Now


Tuesday, 13 September 2016

Evolution Not Creation

Evolution Is Now 


Wings, Legs and Fins




Evolution is change in the heritable traits of biological populations over successive generations. Evolutionary processes give rise to diversity at every level of biological organisation, including the levels of species, individual organisms, and molecules.

Repeated formation of new species (speciation), change within species (anagenesis), and loss of species (extinction) throughout the evolutionary history of life on Earth are demonstrated by shared sets of morphological and biochemical traits, including shared DNA sequences.

These shared traits are more similar among species that share a more recent common ancestor, and can be used to reconstruct a biological "tree of life" based on evolutionary relationships (phylogenetics), using both existing species and fossils.

The fossil record includes a progression from early biogenic graphite, to microbial mat fossils, to fossilized multicellular organisms. Existing patterns of biodiversity have been shaped both by speciation and by extinction. More than 99 percent of all species that ever lived on Earth are estimated to be extinct. Estimates of Earth's current species range from 10 to 14 million, of which about 1.2 million have been documented.

More from source..

It's not confusion - it's evolution.



Coley Cast the First Stone