4 ms·
How do they count the number of new stars? I mean, it's way too far away to see individual stars.
by BurningFrog 5y ago
How do they count the number of new stars?
I mean, it's way too far away to see individual stars.
- keithnz 5y agono, due to gravitational lensing, you can see stars. For a straightforward break down, see Dr Becky, https://www.youtube.com/watch?v=VChgsXbIgdw https://www.youtube.com/watch?v=VChgsXbIgdw
- simonh 5y agoOh grief, I've tried getting into her channel a few times because the content and analysis is fantastic, but the 'effervescent' delivery style is excruciating.
- devoutsalsa 5y agoWhat’s your email address? I’ll send you my toenail moon images.
- stevenrj 5y agoThis galaxy is not being gravitationally lensed though.
- stevenrj 5y agoWe have models for how much light a star of a given mass, age, chemical composition etc. puts out as a function of wavelength. We can then take mixtures of stars and predict the total light output of a stellar population in different bandpasses. So from observations of a galaxy in these different bandpasses, we can use these models to determine things like the age of the stars in the galaxy—from how old the stars in the best fit stellar population are—as well as the mass (or number) of stars—from how many are needed to match the observed brightness of the galaxy.
- BurningFrog 5y agoThat makes sense. Thanks!