Tuesdays · 4–6 PM
Study Hall
Bring your problem sets. Upper-year volunteers circulate to help with first- and second-year physics, astronomy and math.
Events
The Event Horizon.
See what's up.
Talks, observing nights, workshops, and socials. All free, open to everyone, and no background required.
Shadow2.6× wider than the event horizon. Light that comes inside this edge falls in.
Far side of the diskIts light is bent up and over the top of the hole.
Coming toward youDoppler-boosted: brighter and bluer.
Moving awayDimmer and redder.
Inner edge · 3 rsNo stable orbits closer in than this.
Bent starlightThe photo behind the hole, lensed into a ring.
Pillars of Creation · Eagle Nebula (M16) — NASA, ESA, Hubble Heritage TeamLive render — a black hole and its sky, ray-traced in your browser
01Calendar
Upcoming
02Tonight's sky
What's up tonight
Worked out live for Lethbridge: when it gets dark, what the moon is doing, which planets are up and when the International Space Station next flies over.
Working out tonight's sky…
03Every week
Regular orbits
Drop in any week during the fall and winter terms. No sign-up needed.
Alternate Thursdays · 6 PM
Problem Night
A themed puzzle set — Fermi problems, olympiad questions, famous paradoxes — solved in small groups, with snacks.
Clear nights near new moon
Pop-up Observing
When the forecast is good, we announce a short-notice observing session on Instagram. Follow us so you don't miss it.
Placeholder schedule — rooms and times to be confirmed each term
04Archive
Past events
Have an idea?
Propose a talk, workshop or trip.
Members run many of our best events. Tell us what you'd like to see — or present — and we'll help make it happen.