6,217 reputation
21956
bio website astro.uvic.ca/~koman
location Canada
age 25
visits member for 2 years, 3 months
seen 19 mins ago

I am an astrophysics graduate student.


1h
comment How much of a galaxy's mass is in stars?
@KyleKanos certainly related, but hardly a duplicate - this seems to be asking more how to measure the stellar mass of a given galaxy than anything about the global baryon fraction, or stellar mass fraction.
1h
answered How much of a galaxy's mass is in stars?
Nov
21
comment Has the number of new stars born decreased over time? And why?
@DavidLynch no need to replace Universe by Galaxy - we have a pretty good handle on the cosmic mean star formation rate as a function of redshift, at least back to moderate redshifts (~2-3).
Nov
20
reviewed Leave Closed What are fundamental dimensions used to describe the physical universe?
Nov
20
reviewed Approve suggested edit on Energy of a signal
Nov
20
reviewed Approve suggested edit on What is the movement of the material point?
Nov
20
reviewed Close Rotation of a rigid body
Nov
20
reviewed Close What is the movement of the material point?
Nov
20
reviewed Close Why human and most of vertebrates cannot see Near-Infrared light (720nm-1500nm)?
Nov
20
reviewed Close What (if any) state did energy exist in prior to the big bang?
Nov
19
reviewed Approve suggested edit on Does infrared light pass through active shutter glass?
Nov
17
comment How is spectrum controlled?
I'm not sure what you mean by spectrum, but it doesn't seem to be what most people mean when they use that word... Do you perhaps mean in the sense of radio frequencies?
Nov
7
comment How is anything *not* ultimately a position measurement?
Related (but less QM focussed): physics.stackexchange.com/questions/126541/…
Nov
7
reviewed Approve suggested edit on Refraction of light beam water to air
Nov
6
comment What would the collision between a (large) solid planet and a gas giant be like?
No time to write an answer right now, but some of the details will depend on the impact speed - for instance if the impactor is coming in fast enough to be supersonic in the gas giant's atmosphere, you're going to end up with a lot of gas with nowhere to go in a timely manner. Depending on the gas column mass along the direction of impact, you could temporarily punch a hole through the gas giant. At lower speeds, the gas will behave more like a normal fluid, think rock dropping into a (gas) pond.
Nov
6
reviewed Leave Closed Calculating the acceleration in a multiple pulley system with one mass?
Nov
6
reviewed Reopen Can the angular momentum of any rigid body (symmetrical or asymmetrical) be found this way?
Nov
6
reviewed Close How can a black hole reduce the speed of light?
Nov
6
reviewed Leave Open Forces between charged particle
Nov
6
reviewed Leave Open Decoherence without time?