large stars burn the hydrogen fuel in the core quickly, whereas, small stars burn it more slowly. The length of time that they spend on the main sequence depends upon how quickly the hydrogen gets used up. Ther
stars/ IR coloursprotoplanetsphotometrymain sequence starscircumstellar debrisISOfar-infrared excessesWe have been awarded NASA Key Project observing time on ISO, in order to establish the true frequency of far-infrared excesses in a volume-limited sample of main sequence and related stars, and ...
A star that consumes hydrogen to form helium is called a "main-sequence" star for all the time it is a hydrogen-fusing object. When it uses up all its fuel, the core contracts because the outward radiation pressure is no longer enough to balance the gravitational force. The core temperatur...
Once a star has used up all of its hydrogen fuel in the core, it transitions off the main sequence and becomes a red giant. Depending on the mass of the star, it can oscillate between various states before ultimately becoming either a white dwarf, a neutron star or collapse in on itself...
I remember something from the before-times: some clusters, like M3, have blue stars along the main sequence that shouldn't be there if the whole cluster was the same, really old, age. They're called "blue stragglers" as if they lingered on the main sequence like a 30-something hanging...
, which offers interactive coding tutorials, says you can learn Python in as little as two months. But that assumes you can sit in front of a computer every day and practice from 8 a.m. to 5 p.m. If you have a day job, six months may be a more realistic timeline. That would re...
Matt Jewett REI employee Matt Jewett is a former intercollegiate cross-country and track athlete and semi-elite sponsored runner. He has coached numerous runners, from top-ranked high-schoolers to coworkers to his own two daughters and their friends. ...
(or how metal-enriched stars in a galaxy are) for galaxies of different masses. The trend is clear: quenched (red) and quenching (green) galaxies have higher metallicity than actively star-forming, main sequence (blue) galaxies. Thus, the authors conclude that AGN feedback operates primarily ...
Here we show how major rivers can efficiently connect to the deep-sea, by analysing the longest runout sediment flows (of any type) yet measured in action on Earth. These seafloor turbidity currents originated from the Congo River-mouth, with one flow tr
These privileges give them the right to do things like deleting and un-deleting pages, blocking and unblocking IP addresses, etc. Beyond sharing knowledge, Writers, editors and admins work together to solve almost all of the problems that you would expect to arise in an open platform like ...