Following yesterday’s excitement about the new images from the James Webb Space Telescope I thought I’d share this video documentary that explains why the choice of name for this facility is highly inappropriate and should be changed. This is a matter I’ve blogged about previously, in fact, but the video is new.
Archive for astronomy
James Webb: the wrong name for a Space Telescope
Posted in History, LGBT, The Universe and Stuff with tags astronomy, James Webb, James Webb Space Telescope, NASA on July 13, 2022 by telescoperR.I.P. David Hughes (1941-2022)
Posted in The Universe and Stuff with tags astronomy, David W Hughes, Solar System on June 9, 2022 by telescoperI am once again very sorry to have to pass on some sad news. Astronomer David Hughes (formerly of Sheffield University) passed away suddenly on Monday 6th June at the age of 80.
Born in Nottinghamshire, David did his first degree at Birmingham University and his DPhil in Oxford. He moved to Sheffield in 1965 and worked there until he retired in 2007.
David was an expert on the Solar System, especially its minor bodies, such as asteroids and comets; the Mars-crossing asteroid 4205 David Hughes is named in honour of his many achievements. He was also very knowledgeable about the history of astronomy and the threat to Earth from meteors and other impact phenomena. An ebullient public speaker, he was much in demand as a guest on TV programmes, as well as giving lectures on cruise ships and talks to amateur astronomical societies and lay audiences. Through these activities he did a huge amount for the popularization of astronomy especially in the UK.
I send my condolences to his family, friends and colleagues both in Sheffield and around the world.
R.I.P. David W Hughes (1941-2022)
Follow @telescoperDistant Things!
Posted in The Universe and Stuff with tags astronomy, Cosmology, nature, redshift on April 1, 2022 by telescoperI’m a bit late passing this on but there was a great deal of excitement this week at the news that the Hubble Space Telescope (HST) has made an astonishing discovery about the early Universe as illustrated by the above picture published in Nature. As well as an individual star (?) observed at redshift 6.2, so distant that its light set out when the Universe was just 8% of its current age, the image also reveals the presence in the early Universe of large geometric shapes (such as rectangles) as well as a remarkable giant arrow. The presence of these features at such high redshift is completely inconsistent with the standard theory of structure formation.
Follow @telescoperWriting Papers for Scientific Journals
Posted in Literature, The Universe and Stuff with tags arXiv:2110.05503, astronomy on October 14, 2021 by telescoperKnowing that not all readers of this blog have a flair for writing like what I have got, I thought I’d pass on a link to a paper that appeared on the arXiv earlier this week. Here is the abstract:
Writing is a vital component of a modern career in astronomical research. Very few researchers, however, receive any training in how to produce high-quality written work in an efficient manner. We present a step-by-step guide to writing in astronomy. We concentrate on how to write scientific papers, and address various aspects including how to crystallise the ideas that underlie the research project, and how the paper is constructed considering the audience and the chosen journal. We also describe a number of grammar and spelling issues that often cause trouble to writers, including some that are particularly hard to master for non-native English speakers. This paper is aimed primarily at Master’s and PhD level students who are presented with the daunting task of writing their first scientific paper, but more senior researchers or writing instructors may well find the ideas presented here useful.
Knapen et al. 2021, arXiv:2110.05503
The title of the paper is actually Writing Scientific Papers in Astronomy, which seems curious wording to me – rather like Writing Scientific Papers in French (for example) – which is why I didn’t use it for the title of this post. Not that I’m pedantic or anything.
One of the problems with the scientific literature is that most journals have their own style rules which are often in conflict with one another so the detailed guidance on grammar, etc is probably of lesser value than the good tips on how to structure a paper. Those bits apply to any scientific field really, not just astronomy.
I remember very well what a struggle I found it when I wrote my first scientific paper. I had invaluable help, though, from my supervisor, who was an excellent writer. This is well worth reading for those early career researchers who want to avoid at least some of the pain!
The only tip I can offer to a postgraduate student struggling to write a paper is to think of who is going to be reading it. In most cases that will mainly be other early career researchers, so write in such a way that you can connect with them. That usually means, for example, taking special care to explain the things that you found difficult when you started in the area. In other words, you should put enough in your paper to allow someone else entering the field to understand it.
Other tips are of course welcome through the Comments Box.
Follow @telescoperYesterday was nearly Easter
Posted in History, The Universe and Stuff with tags astronomy, computus, Easter, Equinox on March 29, 2021 by telescoperAs as Astronomist I am often asked “How do they calculate the date of Easter?”, to which my answer is usually “Look it up on Wikipedia!“.
The simple answer is that Easter Sunday is on the first Sunday after the first full Moon on or after the Vernal equinox. The Vernal Equinox took place this year on March 20th and the more observant among you will have noticed that yesterday was (a) Sunday and (b) a Full Moon. Yesterday was not Easter Sunday because the rule says Easter is on the first Sunday after the first full Moon on or after the Vernal equinox, which does not include a Full Moon on the first Sunday on or after the vernal equinox. Accordingly Easter 2021 is next Sunday 4th April. If the Full Moon had happened on Saturday, yesterday would have been Easter Sunday.
That is just as well really because next weekend is when the holidays and sporting events have been arranged.
I say “simple” answer above because it isn’t quite how the date of Easter is reckoned for purposes of the liturgical calendar.
For a start the ecclesiastical calculation of the date for Easter – the computus – assumes that the Vernal Equinox is always on March 21st, while in reality it can be a day or two either side of that. This year it was on March 20th.
On top of that there’s the issue of what reference time and date to use. The equinox is a precisely timed astronomical event but it occurs at different times and possibly on different days in different time zones. Likewise the full Moon. In the ecclesiastical calculation the “full moon” does not currently correspond directly to any astronomical event, but is instead the 14th day of a lunar month, as determined from tables (see below). It may differ from the date of the actual full moon by up to two days.
There have been years (1974, for example) where the official date of Easter does not coincide with the date determined by the simple rule given above. The actual rule is a complicated business involving Golden Numbers and Metonic cycles and whatnot.
I’m grateful to Graham Pointer on Twitter for sending this excerpt from the Book of Common Prayer that sheweth how to determine the date of Easter for any year up to 2199:
I don’t care what happens after that as I’ll be retired by then. If you apply this method to 2021 you will find it is an 8C. Next year will be a 9B. Further calculations are left as an exercise to the reader.
R.I.P. Sir Arnold Wolfendale (1927-2020)
Posted in Biographical, The Universe and Stuff with tags Arnold Wolfendale, astronomy, Durham University, Sir Arnold Wolfendale on January 4, 2021 by telescoperI’ve just heard the sad news that former Astronomer Royal Sir Arnold Wolfendale passed away on December 21st 2020 at the age of 93. There’s a full tribute to him here from Durham University, where he spent most of his very distinguished career as a cosmic ray physicist and played such an important role in developing a worldwide centre of excellence in Astronomy.
I remember Arnold Wolfendale very well from many trips to Durham over the years, starting with the SERC School for new postgraduate students in Astronomy I attended in 1985. He was an avuncular and extremely friendly presence there who went to a lot of trouble to talk to studdents; you can see him in the front row of the now (in)famous group photograph taken there:
Rest in peace, Sir Arnold Wolfendale (1927-2020)
17 Postdoctoral Positions in Astronomy all at the same Institution!
Posted in The Universe and Stuff with tags astronomy, Instituto de Astrofísica de Canarias, tenerife on October 1, 2020 by telescoperI know how difficult it is for budding astronomers to find postdoctoral positions, so when I saw that there are no fewer than 17 such positions have become available at the same time at the same institution – Instituto de Astrofísica de Canarias (IAC) on Tenerife (Spain) – I couldn’t resist sharing. Postdoc positions are a bit like buses: you can wait ages for one, and then seventeen come along all at the same time!
Below you will find links these positions, most of which have deadlines at the end of October (except one with has 15th October, and one at the end of November). Applicants must have their PhD by the time of the application deadline.
The Galaxias 2020 post is in Johan Knapen’s group, and can be to work on deep imaging from LSST.
You will see that 12 of the 17 positions are for 4-year ‘Advanced Fellow’ positions, several of which are in the area of formation and evolution of galaxies. Other areas are Solar physics, exoplanets, stellar and interstellar physics, Milky Way and Local Group, and cosmology & astroparticles.
Other galaxies-related positions are the HARMONI and the ‘Estallidos’ ones; EUROCC is for supercomputing support.
– 12 contratos PS-2020-040 Advanced -Fellows SO 2020 (deadline: 31/10/20)
https://www.iac.es/en/employment/doce-contratos-postdoctorales-advanced-fellows-so-2020twelve-postdoctoral-contracts-advanced-fellows-so-2020-ps
– 1 contrato PS-2020-041 Galaxias 2020 (deadline: 31/10/20)
https://www.iac.es/en/employment/un-contrato-postdoctoral-galaxias-2020one-postdoctoral-contract-galaxias-2020-ps-2020-041
– 1 contrato PS-2020-043 HARMONI 2020 (deadline: 31/10/20)
https://www.iac.es/en/employment/un-contrato-postdoctoral-harmoni-2020one-postdoctoral-contract-harmoni-2020-ps-2020-043
– 1 contrato PS-2020-044 Astroparticulas-MAGIC 2020 (deadline 30/11/20)
https://www.iac.es/en/employment/un-contrato-postdoctoral-astroparticulas-magicone-postdoctoral-contract-astroparticulas-magic-2020-ps-2020-044
– 1 contrato PS-2020-045) EUROCC 2020 (deadline: 31/10/20)
https://www.iac.es/en/employment/un-contrato-postdoctoral-eurocc-2020one-postdoctoral-contract-eurocc-2020-ps-2020-045
– 1 contrato PS-2020-049 Estallidos 2020 (deadline: 15/10/20)
https://www.iac.es/en/employment/un-contrato-postdoctoral-estallidos-2020one-postdoctoral-contract-estallidos-2020-ps-2020-049
Astronomy Photograph of the Year 2020
Posted in Art, The Universe and Stuff with tags Andromeda Nebula, astronomy, Astronomy Photographer of the Year 2020, M31, Nicolas Lefaudeux on September 24, 2020 by telescoperVery busy today so I only have time to share a this stunning picture, the overall winner of the 2020 Astronomy Photographer of the Year, Andromeda Galaxy at Arm’s Length? by Nicolas Lefaudeux (France).
Watch “Why the Universe is quite disappointing, really – Episode 4” on YouTube
Posted in The Universe and Stuff, YouTube with tags astronomy, dust, galaxies, M31, M64 on May 19, 2020 by telescoperEpisode 4, in which I show that spiral galaxies are very grubby – they contain huge amounts of dust. And not only galaxies – astronomical dust is everywhere we look. The Universe may be big, but it sure is dirty..