University of Groningen
The Galactic halo: formation history and dynamics
Koppelman, Helmer
DOI:
10.33612/diss.132960706
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Publication date: 2020
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Koppelman, H. (2020). The Galactic halo: formation history and dynamics. University of Groningen. https://doi.org/10.33612/diss.132960706
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Propositions
accompanying the thesisThe Galactic halo: formation history and dynamics
1. The properties of accreted galaxies can be inferred from carefullystudy-ing the properties of their debris. (Chapters 3,4)
2. A merger of galaxies can be a very violent event, when the smaller of two similarly-sized galaxies is shredded apart its pieces can be mistaken for the debris of multiple small galaxies. (Chapter 7)
3. Just like humans, stars that stand out from the many are often the most interesting. (Chapters 2,3,5,7,8)
4. Most of the stars in the local stellar halo originate in a single massive dwarf galaxy. (Chapters 2,3,7)
5. To enable intergalactic space-travel we require rockets leaving the solar vicinity with velocities greater than 500 km/s. (Chapter 9)
6. They say that time heals all wounds, but gaps in stellar streams on av-erage grow in size: linearly with time. (Chapter 10)
7. Self-proclaimed experts that criticise technology and science can be a danger to society if they do not see their own shortcomings.
8. Critics of “useless” science have a lot to learn; when everything is auto-mated we will all be looking for work “without direct applications”. 9. Being a good astronomer is like being a one-person band: one should
master observations, theory, simulations, statistics, mathematics, pro-gramming, data science, and big data – not to mention communication and other soft skills.
10. “If you can’t communicate and talk to other people and get across your ideas, you’re giving up your potential.” – Warren Buffett
11. Science is not recognised properly for the approximately exponential growth that the world-leading economies have experienced since the early 1900s.
12. A common pitfall for scientists is the drive to understand everything.
