Paul Sutton – personal blog
Introduction to gravitational wave astronomy
I was searching for a paper to go along side the previous post on SN2023ixf. But happened upon this.
Another arXiv article with an Introduction to gravitational wave astronomy so I will link to this here. Happy reading.
As always we can discuss :-
Type II supernova
An explanation as to what a type II supernova is, can be found on wikipedia. This is fine for this article but please remember Wikipedia is NOT an academic source of information.
Another interesting fediverse from @AkaSci looking at the spectrum of type II supernova SN 2023ixf.
Spectrum data for Supernova SN 2023ixf in visible light wavelengths, captured yesterday, is shown below. The spectrum is rich in blue wavelengths; it has prominent peaks at wavelengths (shown as vertical lines) associated with emissions from Hydrogen. The peaks around 475 nm are associated with He, C and N.
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Interesting research results
This is interesting and another reason I like it on the Fediverse. Happy reading.
JWST finds water on Enceladus
Posted to the Fediverse on 30/5/2023. The James Webb Space Telescope has potentially found water on Enceladus, one of the moons of Saturn. This is a great discovery and shows there is water on other planets. You can read original fediverse post via link below.
The following graphic was also part of the post, so reproducing here too.
Feel free to discuss further either tag me on fedi @[email protected]. Or you can start a thread on Science Forums
Sorry, I don't use mainstream social media. This is 2023, the fediverse provides intellectual content.
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Code Club 17/6/2023
The next Paignton Library code club is on Saturday 17th June 2023 10 am to 12:00. We will carry on with with the Code Club projects. The write up from last session is here and the write up from Saturdays STEM group event is here.
I have put some of the links from this below as a list.
Useful Links
If you also sign up to the Raspberry Pi foundation, you can track your own progress and collect badges. This is optional, as this presents more ways for data to be collected.
As before if you would like to save work, please sign up for a scratch or Trinket account so you can save project progress and carry on at home or at the next session.
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#CodeClub,#Projects,#Python,#Scratch,#Coding.#Programming,#Children, #Education
Debian 12 “bookworm” released
June 10th, 2023
After 1 year, 9 months, and 28 days of development, the Debian project is proud to present its new stable version 12 (code name “bookworm”).
“bookworm” will be supported for the next 5 years thanks to the combined work of the Debian Security team and the Debian Long Term Support team.
Following the 2022 General Resolution about non-free firmware, we have introduced a new archive area making it possible to separate non-free firmware from the other non-free packages:
non-free-firmware
Most non-free firmware packages have been moved from non-free to non-free-firmware. This separation makes it possible to build a variety of official installation images.
Debian 12 “bookworm” ships with several desktop environments, such as:
Gnome 43, KDE Plasma 5.27, LXDE 11, LXQt 1.2.0, MATE 1.26, Xfce 4.18
This release contains over 11,089 new packages for a total count of 64,419 packages, while over 6,296 packages have been removed as “obsolete”. 43,254 packages were updated in this release. The overall disk usage for “bookworm” is 365,016,420 kB (365 GB), and is made up of 1,341,564,204 lines of code.
“bookworm” has more translated man pages than ever thanks to our translators who have made man-pages available in multiple languages such as: Czech, Danish, Greek, Finnish, Indonesian, Macedonian, Norwegian (Bokmål), Russian, Serbian, Swedish, Ukrainian, and Vietnamese. All of the systemd man pages are now completely available in German.
The Debian Med Blend introduces a new package: shiny-server which simplifies scientific web applications using R. We have kept to our efforts of providing Continuous Integration support for Debian Med team packages. Install the metapackages at version 3.8.x for Debian bookworm.
The Debian Astro Blend continues to provide a one-stop solution for professional astronomers, enthusiasts, and hobbyists with updates to almost all versions of the software packages in the blend. astap and planetary-system-stacker help with image stacking and astrometry resolution. openvlbi, the open source correlator, is now included.
Support for Secure Boot on ARM64 has been reintroduced: users of UEFI-capable ARM64 hardware can boot with Secure Boot mode enabled to take full advantage of the security feature.
Debian 12 “bookworm” includes numerous updated software packages (over 67% of all packages from the previous release), such as:
Apache 2.4.57 BIND DNS Server 9.18 Cryptsetup 2.6 Dovecot MTA 2.3.19 Emacs 28.2 Exim (default email server) 4.96 GIMP 2.10.34 GNU Compiler Collection 12.2 GnuPG 2.2.40 Inkscape 1.2.2 The GNU C Library 2.36 lighthttpd 1.4.69 LibreOffice 7.4 Linux kernel 6.1 series LLVM/Clang toolchain 13.0.1, 14.0 (default), and 15.0.6 MariaDB 10.11 Nginx 1.22 OpenJDK 17 OpenLDAP 2.5.13 OpenSSH 9.2p1 Perl 5.36 PHP 8.2 Postfix MTA 3.7 PostgreSQL 15 Python 3, 3.11.2 Rustc 1.63 Samba 4.17 systemd 252 Vim 9.0
With this broad selection of packages and its traditional wide architecture support, Debian once again stays true to its goal of being “The Universal Operating System”. It is suitable for many different use cases: from desktop systems to netbooks; from development servers to cluster systems; and for database, web, and storage servers. At the same time, additional quality assurance efforts like automatic installation and upgrade tests for all packages in Debian's archive ensure that “bookworm” fulfills the high expectations that users have of a stable Debian release.
A total of nine architectures are officially supported for “bookworm”:
32-bit PC (i386) and 64-bit PC (amd64), 64-bit ARM (arm64), ARM EABI (armel), ARMv7 (EABI hard-float ABI, armhf), little-endian MIPS (mipsel), 64-bit little-endian MIPS (mips64el), 64-bit little-endian PowerPC (ppc64el), IBM System z (s390x)
32-bit PC (i386) no longer covers any i586 processor; the new minimum processor requirement is i686. If your machine is not compatible with this requirement, it is recommended that you stay with bullseye for the remainder of its support cycle.
The Debian Cloud team publishes “bookworm” for several cloud computing services:
Amazon EC2 (amd64 and arm64), Microsoft Azure (amd64), OpenStack (generic) (amd64, arm64, ppc64el), GenericCloud (arm64, amd64), NoCloud (amg64, arm64, ppc64el)
The genericcloud image should be able to run in any virtualised environment, and there is also a nocloud image which is useful for testing the build process.
GRUB packages will by default no longer run os-prober for other operating systems.
Between releases, the Technical Committee resolved that Debian “bookworm” should support only the merged-usr root filesystem layout, dropping support for the non-merged-usr layout. For systems installed as buster or bullseye there will be no changes to the filesystem; however, systems using the older layout will be converted during the upgrade. Want to give it a try?
If you simply want to try Debian 12 “bookworm” without installing it, you can use one of the available live images which load and run the complete operating system in a read-only state via your computer's memory.
These live images are provided for the amd64 and i386 architectures and are available for DVDs, USB sticks, and netboot setups. The user can choose among different desktop environments to try: GNOME, KDE Plasma, LXDE, LXQt, MATE, and Xfce. Debian Live “bookworm” has a standard live image, so it is also possible to try a base Debian system without any of the graphical user interfaces.
Should you enjoy the operating system you have the option of installing from the live image onto your computer's hard disk. The live image includes the Calamares independent installer as well as the standard Debian Installer. More information is available in the release notes and the live install images sections of the Debian website.
To install Debian 12 “bookworm” directly onto your computer's storage device you can choose from a variety of installation media types to Download such as: Blu-ray Disc, DVD, CD, USB stick, or via a network connection. See the Installation Guide for more details.
Debian can now be installed in 78 languages, with most of them available in both text-based and graphical user interfaces.
The installation images may be downloaded right now via bittorrent (the recommended method), jigdo, or HTTP; see Debian on CDs for further information. “bookworm” will soon be available on physical DVD, CD-ROM, and Blu-ray Discs from numerous vendors too. Upgrading Debian
Upgrades to Debian 12 “bookworm” from the previous release, Debian 11 “bullseye”, are automatically handled by the APT package management tool for most configurations.
Before upgrading your system, it is strongly recommended that you make a full backup, or at least back up any data or configuration information you can't afford to lose. The upgrade tools and process are quite reliable, but a hardware failure in the middle of an upgrade could result in a severely damaged system. The main things you'll want to back up are the contents of /etc, /var/lib/dpkg, /var/lib/apt/extended_states and the output of: $ dpkg —get-selections '*' # (the quotes are important)
We welcome any information from users related to the upgrade from “bullseye” to “bookworm”. Please share information by filing a bug in the Debian bug tracking system using the upgrade-reports package with your results.
There has been a lot of development to the Debian Installer resulting in improved hardware support and other features such as fixes to graphical support on UTM, fixes to the GRUB font loader, removing the long wait at the end of the installation process, and fixes to the detection of BIOS-bootable systems. This version of the Debian Installer may enable non-free-firmware where needed.
The ntp package has been replaced with the ntpsec package, with the default system clock service now being systemd-timesyncd; there is also support for chrony and openntpd.
As non-free firmware has been moved to its own component in the archive, if you have non-free firmware installed it is recommended to add non-free-firmware to your APT sources-list.
It is advisable to remove bullseye-backports entries from APT source-list files before the upgrade; after the upgrade consider adding bookworm-backports.
For “bookworm”, the security suite is named bookworm-security; users should adapt their APT source-list files accordingly when upgrading. If your APT configuration also involves pinning or APT::Default-Release, it is likely to require adjustments to allow the upgrade of packages to the new stable release. Please consider disabling APT pinning.
The OpenLDAP 2.5 upgrade includes some incompatible changes which may require manual intervention. Depending on configuration the slapd service may remain stopped after the upgrade until new configuration updates are completed.
The new systemd-resolved package will not be installed automatically on upgrades as it has been split into a separate package. If using the systemd-resolved system service, please install the new package manually after the upgrade, and note that until it has been installed, DNS resolution may no longer work as the service will not be present on the system.
There are some changes to system logging; the rsyslog package is no longer needed on most systems, and is not installed by default. Users may change to journalctl or use the new “high precision timestamps” that rsyslog now uses.
Possible issues during the upgrade include Conflicts or Pre-Depends loops which can be solved by removing and eliminating some packages or forcing the re-installation of other packages. Additional concerns are “Could not perform immediate configuration ...” errors for which one will need to keep both “bullseye” (that was just removed) and “bookworm” (that was just added) in the APT source-list file, and File Conflicts which may require one to forcibly remove packages. As mentioned, backing the system up is the key to a smooth upgrade should any untoward errors occur.
There are some packages where Debian cannot promise to provide minimal backports for security issues. Please see the Limitations in security support.
As always, Debian systems may be upgraded painlessly, in place, without any forced downtime, but it is strongly recommended to read the release notes as well as the installation guide for possible issues, and for detailed instructions on installing and upgrading. The release notes will be further improved and translated to additional languages in the weeks after the release.
STEM Group 10/6/2023 Write up
So today we carried on with the Code Club python track and we are making good progress with this. I spent some time working with two new attendees who I started off with Scratch, so logged in with the code club accounts so projects could be saved.
We mostly were just exploring and experimenting with Scratch and trying a few things out. All being well,. they will be at code club next week.
Towards the end of the morning session, I spent some time chatting about a potential visit to a school and talk to year 5 classes about code club and what we are learning.
While the STEM event runs till 3 not everyone can stay. As a result by about 12:15 most people had gone, so I tidied up.
I then spent some time with one of the library young volunteers, testing one of the Raspberry Pi's, minetest, ironed out a few issues, then we had a go with Python, writing some small simple programs but this went really well, extended invite to code club so we can carry on working with Python.
So next week will be more Scratch and Python and perhaps some Raspberry Pi pico and hour of code activities, depending on who makes it.
Useful Links
A few extra links that came from Code club on 20/5/2023
Next code club is on 17th June 10 – 12 at the library. The next stem group will be on 8th July 11am to 15:00. We will carry on from the previous code club, but also look at our own projects a bit more.
Raspberry Pi – Micropython book
I now have a copy of the Raspberry Pi, MicroPython book which is aimed at users of the Raspberry Pi Pico microcontroller board.
I will bring this to the meeting today, along with some other resources. I also bought a Raspberry Pi Pico. I can experiment with this at home before Saturday.
So hopefully, we can do some more hardware / software hacking with this.
#PaigntonLibrarySTEMGroup,#CodeClub,#Python,#Hardware, #Hacking
Debian 12 release
Debian 12 (Bookworm) should be released today
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Physicists suggest that black holes could have an exit to other places in the universe
Interesting article from Meson Stars regarding black holes having possible exits. I have included a paste of my Fediverse comment below. However feel free to discuss on Fediverse or on Science forums.
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Comment
This does make some sense, I have heard about white holes, which are the opposite of black holes as they allow matter to be ejected in to space. This seems to tie in with the suggestion in the article that if you could pass through you cannot get back again. However in relation to this
"Scientists have already said that all matter inside a black hole is destroyed, "
I got the impression matter can't be created or destroyed, it is interchangeable with energy. In which case, could it be that matter is drawn in to a black hole, somehow converted in to energy then ejected from a white hole?
So purely on a speculative idea
So how do we find these white holes, perhaps we have already found them as we can detect things like gamma ray bursts or neutrino emissions but can't always explain them, perhaps these are related to white holes and we are observing the release of energy in to space as these or similar phenomenon
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