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People_of_Space: Profile picture
@People_Of_Space
May 22, 2020 • 13 tweets • 11 min read • Read on X
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Today for my last day of tweeting, I want to talk about highlights from #MarsExpress & later from @esamarswebcam! This thread will be some highlights from the mission as a whole 🙂🔴🛰️. This fantastic image is from HRSC 📸dlr.de/content/en/art… (📷: ESA/DLR/FU Berlin) Image
(I talked about the background of the #MarsExpress mission in this thread a few days ago). Now, onto some science/mission/fun highlights! 🌌🔴🛰️
First, a fun one! (sorry for *spoilers*!! 🙈) Following on from me declaring my love for 'The Martian' yesterday, HRSC 📸 on #MarsExpress mapped out the route Mark Watney takes, and also reconstructed that journey in 3D! (📷: ESA/DLR/FU Berlin) Image
What about water on Mars? In 2018 the radar 📡 instrument MARSIS on #MarsExpress detected evidence of a subglacial lake ⬇️ the south polar cap! 💧 The bright radar echo is interpreted as the interface between ice & a stable body of liquid (salty 🧂) water! esa.int/Science_Explor… Image
Elsewhere, the #MarsExpress mission has also contributed significantly to the (controversial!) story of methane on Mars 🤯. Methane was tentatively detected early in the MEX mission but remained controversial within the scientific community: esa.int/Science_Explor…
Last year, the PFS instrument on #MarsExpress published an independent confirmation of a methane spike on Mars seen by @MarsCuriosity, and suggested a source region east of Gale Crater 🛰️. Methane is interesting because it *could* be related to life 🦠👀
I particularly liked this piece by @kchangnyt in the New York Times which discusses a new spike found by @MarsCuriosity in June 2019, but also details the methane story which includes the measurements from #MarsExpress 🔴🛰️ nytimes.com/2019/06/22/sci…
Another #MarsExpress highlight is the estimation of the current rate of atmospheric escape using data from the ASPERA instrument! ⚛️ sci.esa.int/web/mars-expre… (Unfortunately Twitter botches the quality of videos, see it in better quality here: sci.esa.int/web/mars-expre…) (📽️: ESA)
Investigations into atmospheric loss are important for determing how Mars lost its early atmosphere 🔴. A 'warm & wet' early Mars is evidenced by features we see today such as those present in this HRSC image of Arda Valles (esa.int/Science_Explor…) (📷: ESA/DLR/FU Berlin) Image
On the mission operations side of things, if you want to know more about how engineers like @marwood82 have kept #MarsExpress going for 16+ years (🤯) this is a great article by @richard_speed detailing that, including the switch to 'gyro-less' mode! 🔴🛰️ theregister.co.uk/2020/03/31/mar…
I'll end with some of my favourite photos from HRSC, bc everyone loves pictures of Mars right? 😉🔴 From upper left to bottom right: Perspective view of North Polar ice cap ❄️; area near north pole; Olympus Mons Caldera 🌋; Dark dunes of Moreux crater (all 📷: ESA/DLR/FU Berlin) ImageImageImageImage
More HRSC #MarsExpress photo highlights! 📸 From upper left to bottom right: Perspective view of Korolev crater; view of Deuteronilus Mensae showing evidence for glacial activity ❄️; Perspective view in Noctis Labyrinthus; Phobos (one of the Martian moons) (📷: ESA/DLR/FU Berlin) ImageImageImageImage
So, tldr; #MarsExpress mission highlights include the detection of a subglacial lake; detection of a methane spike; investigations into atmospheric escape on Mars; moving to a new 'gyroless' mode to extend the mission; and awesome pictures of Mars!! 😀🔴🛰️ esa.int/Science_Explor…

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More from @People_Of_Space

People_of_Space: Profile picture
Jan 30, 2022
PEOPLE OF SPACE! I’m super excited to be hosting this week! We’ll be covering a bunch of topics that are near and dear to me including #space (obviously), astronomy, supernovae, radio astronomy, science communication, and MORE
🧵
#science #scicomm #spacetwitter #intro #Thread
But who is this random dude yelling at us about space?
Well the short version is that I’m a physicist who finished high school with every intention of becoming a lawyer - pictured is 19yo me not caring about science
#accidentalscientist #accidentalphysicist #throwback #SPACE 10 years ago before I had considered a career in science - I
For a slightly longer version you can check out this #thread I did on my @funfactscience account recently to reintroduce myself to #spacefam and any newcomers to my page
#introductions #spacetwitter #space
Read 7 tweets
People_of_Space: Profile picture
Jul 26, 2021
The mission patch was based on a design from well known Italian fashion designer, Emilio Pucci. The design has three stylized birds flying over the Hadley-Appenine landing site with the crew names on the lower part of the outer border.
In an early version of an Easter egg, the crew snuck a Roman numeral XV into the crater shadows. According to a story I heard from one of Al Worden's @ExploreSpaceKSC presentations, NASA discouraged Roman numerals on the Apollo patches, thus the hidden nature.
Before his passing last year, @WordenAlfred was a regular astronaut host at @ExploreSpaceKSC giving presentations guiding tours and being an affable ambassador of the Apollo program to a new audience.
Read 4 tweets
People_of_Space: Profile picture
Jul 26, 2021
On board were (left to right) Lunar Module Pilot Jim Irwin, Commander Dave Scott, and Command Module Pilot Al Worden
The landing site was Hadley-Appenine, on the edge of Mare Imbrium. It was bordered by Hadley Rille, a valley-like geological structure and the Montes Apenninus, or Appenine Mountains. The Palus Putredinus was a lava field that filled the area.
Read 7 tweets
People_of_Space: Profile picture
Jul 16, 2021
Today I’ll be working on some research for the big Mars exhibition! As I said yesterday, I’m working on researching how people have been imaging the Red Planet throughout history.
Today we have orbiters circling Mars and rovers that take pictures of the surface. But the history of imaging Mars stretches back centuries, from depicting Mars in art to the canals people thought they saw on the planet.
What are some of your favourite images of Mars and why?
Read 9 tweets
People_of_Space: Profile picture
Jul 15, 2021
Going to talk about designing a temporary display today!
In Science Museum lingo, there are 2 kinds of displays:
🚀Exhibitions (temporary displays) - these can last up to a year
🚀Galleries (permanent displays)
Even a temporary display might take several years to prepare for, with overviews and detailed proposals.
Read 5 tweets
People_of_Space: Profile picture
May 15, 2021
🧬 Life as we don't know it 🧫

Exotic solvents & life's building blocks are among the more speculative
#astrobiology topics, but still important to study scientifically! Our own system contains places potentially able to host life unlike on Earth. Not just Titan!

#AstroThread
All Earth life is carbon-based and needs water to survive. 💦

'Mildly' exotic life might share these traits, but use e.g. other information molecule (or differently coded DNA, even with different/more 'letters') or opposite chirality (left/right-handedness) of some compounds. ImageImage
There are countless possibilities of different information molecules and their coding. Is Earth DNA and RNA a ', frozen accident', or does it have a phys/chem reason? And is all life chiral? In the same way, or is that another frozen accident? What about the amino acids we use? Image
Read 82 tweets

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