Update 5 September 2022. A video covering much of the material in this post is available at: https://youtu.be/hw07Yh7b63M ------------------------------------------------------------------------------------------------------ Original post below Although the Universe may be infinite in extent, in the generally accepted Big Bang cosmology we can only see a small fraction of it. This is known as the observable universe. Field of… Continue reading Cosmic Horizons
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Life on Venus?
Many of you will have seen the story widely reported in the media of the discovery of the gas phosphine in the clouds of Venus - if not, you can find the story here: https://www.bbc.co.uk/news/science-environment-54133538. On Earth phosphine is produced by bacteria and it has led to the interesting speculation as to whether there could be… Continue reading Life on Venus?
Surveying the Cosmos – Part II
In a previous post I talked about the Large Synoptic Survey Telescope (LSST), a large telescope being built in Chile which will spend 90% of its time surveying most of the sky a total of 1000 times over a 10 year period (in the remaining 10% it will revisit areas of specific interest). In this… Continue reading Surveying the Cosmos – Part II
The Brightness of Venus
Anyone, even the most casual observer, looking at the evening sky in the last month will have noticed the brilliant white planet Venus shining in the west. Often known as the Evening Star, Venus is the third brightest natural object in the sky after the Sun and the Moon. In this post I’ll talk about… Continue reading The Brightness of Venus
SpaceX Starlink Satellites
Update 16 March 2022- click on the image below to view a video of much of the information in this post Many of you will have seenthe pictures in 2019 showing long ‘trains’ composed of as many as sixty SpaceX Starlink satellites crossing the sky. A 'train' of SpaceX Starlink satellites just after their… Continue reading SpaceX Starlink Satellites
Explaining Science 