WWW: Searching for Signs of Subsurface Life on Mars (Extinct and Extant) - Shared screen with speaker view
I tried selecting my headset, there is no "phone audio" option
Is it not better?
I tried speaking, but maybe nobody heard me.
Good morning, everyone!
Hi Diana N!
Hi Everybody, I'm here but with my two children - so sometimes might be a bit away from my laptop.
Mary Sue Bell
BRAILLE is coordinated through Blue Marble Space Institute of Science (Yay!) & NASA Ames Research Center
Yay, Blue Marble!
Mary Sue Bell
This is gonna be my drive-time podcast so I'm just listening today.
We are glad yo have you Mary Sue!!
Everyone please let me know if you need an invite to slack
Here is a link that should work - https://join.slack.com/t/marsunderground/shared_invite/enQtNjg0NzU1MzQ2MTMxLWMwN2FhYTYzNTAzNWIzMzkxMWE4NDczZDhmOWRkMTdkZWYzNGFmZjU1OTAyNWU5MWE1YzVmNDUyZmQ0MTNkYTg
Nice job, Diana!
Thanks Diana for jamming this in before you teach in a few minutes.
Presenters, please start your video during your presentation. I’ll send a little reminder to you before you begin.
Everyone, please fill out the sign in form, even if you filled out the form in VM#1. We are “taking attendance: at each VM Session - https://forms.gle/sTEjei7ha4A3zmiE9
Hi Jen P)
For me, the form link works on Chrome and Safari but not on Firefox, so if you are having issues, try another browser.
Reimagine Viking. Great exercise!
It says I am muted
How can this paper be in Nov 2019 which is in the future. Is this a typo?
Don’t know Carol, I will check
Maybe it’s an online preview?
HI sorry, it was misleading, it is available online since july 12th, but it will be published in the november issue.
The future date is correct, 15 November 2019.
Here is the link for the online version:https://authors.elsevier.com/a/1ZPhi4L-YR2pv
Oops, sorry, that link is through a proxy.
Yes, the Icarus november articles are already online.
Thanks for the link Brian.
This is not a bad thing. Since (per)chlorate reducers make oxygen, there could be some interesting implications for a potential microbial community….
Slack Channel invite - https://join.slack.com/t/marsunderground/shared_invite/enQtNjg0NzU1MzQ2MTMxLWMwN2FhYTYzNTAzNWIzMzkxMWE4NDczZDhmOWRkMTdkZWYzNGFmZjU1OTAyNWU5MWE1YzVmNDUyZmQ0MTNkYTg
Are there different O2 limits for obligate vs facultative aerobes? i.e., can facultative aerobes tolerate lower concentrations than obligate?
That’s my gut response as well :)
hahaha, I just BET it’s your gut response
Ha! Makes sense — thanks
Following on Heather’s question: yes, what’s the best way, currently, to determine metabolic activity in samples collected at depth? Compare (ratio) ATP and DNA concentration at depth and at surface? Other ways?
Can we get a reference or post TC’s review paper?
A paper relevant to Martian perchlorate brines: https://doi.org/10.3389/fmicb.2017.02571
We will give a link to TC’s paper on Slack asap.
AGU Session: New Mars Underground 2.0
Jen, i think TC’s group has done some cool work with amino acid composition in deep biosphere samples that can serve as a proxy for activity too…
Thanks all - interesting zoom call. I gotta go to my next meeting….!
Questions to discuss in Slack (VM#1 Channel ) - What is the current evidence that extant life could exist on Mars?Did we explore the right places or collect the right data so far to be at all able to judge whether there could be extant life on Mars? Do we have enough data to think or are we still in the realm of “believing or not”?Is the subsurface the major or even only realistic target when exploring extant life on Mars? Alternatives for extant life?What do we know about the extent of liquid water on Mars?
Onstott et al. 2018: https://doi.org/10.1089/ast.2018.1960
Also there’s a new paper in Astrobiology on life detection in deep ice, Eshelman et al. (2019)
Everyone, Please make sure to vote in the general slack channel for what kind of document repository you would like to use. We will add all these papers that everyone is linking for people to find...
Here is another perchlorate brines/life paper in salty environments - https://www.liebertpub.com/toc/ast/19/5
Fingerprinting Non-Terran Biosignatures: https://doi.org/10.1089/ast.2017.1712
Don’t forget chaotropicity!! Even if the water activity is high, if the Mg or ClO4 levels are too high, it may not be permissive for life.
Indeed, chaotropicity makes things even trickier. I’m pretty sure I don’t understand it very well.
Good Point….But there may be bugs that can deal with those high levels…
I agree with Penny
The minimal data so far doesn’t look good for high Mg etc. levels.
But there is so little data
Great meeting! Thanks!!
thanks everyone so long
Thanks everyone, I feel hopeful for the future of Mars astrobiology.
Thank you all!
Thank you all!