RCSIRCSIRCSI

Atmospheric gases scatter blue light more than other wavelengths, giving the Earth a blue halo when seen from space

My background and introduction:

en-3This user can contribute with an advanced level of English.	zh該用戶的母語是中文。 该用户的母语是中文。	This user enjoys electronics or is an electronics hobbyist.
es-1Este usuario puede contribuir con un nivel básico de español.	ja-1この利用者は初級の日本語ができます。	RCSIThis user attends or attended the Royal College of Surgeons in Ireland.
TASThis user is a TAS Tiger.	This user runs macOS.	JHUThis user attends or attended Johns Hopkins University
SGThis user activates the Stargate to explore other planets.	BSThis user has a Bachelor of Science degree in Biomedical Engineering.	This user is a medical student.

Places in the world that I've been to:

Ireland (Now)	United Kingdom	Hungary	United States	Malaysia	Canada	UAE (Transit)
Sweden	France	Austria	Monaco	Czech Republic	The Netherlands	Thailand (Transit)
Hong Kong	Japan	The PRC	Singapore	South Korea	Taiwan	Philippines

Places in the US that I have been to:

New York	New Jersey	Maryland	New Hampshire	Pennsylvania (Transit)	Arizona (Transit)
Washington DC	Massachusetts	Florida	California	Georgia (Transit)	Illinois (Transit)