"Third, adopting an inclination of 17° between the approaching
jet and the line of sight (Walker et al. 2018), the west orientation
of the jet, and a corotating disk model, matter in the bottom part
of the image is moving toward the observer (clockwise rotation
as seen from Earth). "
As a deaf person, I use https://www.ava.me/ most of the time. It allows me to host a group conversation and have speakers labeled if everyone else uses the app but that's a chore to set up sometimes. It's also quite pricey at $30 per month and some months I use it for less than a hour. It can voice what you type if you want, but I normally voice for myself. I also used to use Keep Notes & the 'mic' icon in a pinch, but that would turn itself off if it didn't pick up any speech in some time.
Action may be required to prevent your Let's Encrypt certificate renewals from breaking.
If you already received a similar e-mail, this one contains updated information.
Your Let's Encrypt client used ACME TLS-SNI-01 domain validation to issue a certificate in the past 60 days. Below is a list of names and IP addresses validated (max of one per account):
example.com (x.x.x.x) on 2018-12-05
TLS-SNI-01 validation is reaching end-of-life. It will stop working temporarily on February 13th, 2019, and permanently on March 13th, 2019. Any certificates issued before then will continue to work for 90 days after their issuance date.
You need to update your ACME client to use an alternative validation method (HTTP-01, DNS-01 or TLS-ALPN-01) before this date or your certificate renewals will break and existing certificates will start to expire.
Our staging environment already has TLS-SNI-01 disabled, so if you'd like to test whether your system will work after February 13, you can run against staging: https://letsencrypt.org/docs/staging-environment/
Our forum has many threads on this topic. Please search to see if your question has been answered, then open a new thread if it has not:
https://community.letsencrypt.org/