Sentences with phrase «intrinsic brightness»

A protein with a high intrinsic brightness that does not fold well or can not be detected in a microscopy setup has zero practical brightness and is of no use.

Astronomers use supernovae in the same way, since supernovae often explode with about the same intrinsic brightness as one other, and then appear dimmer depending on how far away they are.

Because of their identical intrinsic brightness, they earned the nickname «standard candles.»

For these reasons, we render a verdict of somewhat plausible for the merger scenario and very unlikely for other explanations invoking intrinsic brightness variations.

As a class, type Ia supernovae explode with remarkably similar intrinsic brightness, a property that makes them useful «standard candles» — some say «standard bombs» — for exploring the distant universe.

These catastrophic stellar explosions were once thought to have the same intrinsic brightness, meaning they appeared brighter or dimmer depending only on their distance from Earth.

Most such explosions are thought to have an identical intrinsic brightness, which Sandage and his colleagues have found by measuring the distances of two nearby galaxies that have spawned type Ia supernovae.

Leavitt analyzed these Cepheids more thoroughly than her predecessors and noticed that the stars» brightness varied on a regular schedule that depended on their intrinsic brightness.

Distance to a Cepheid nearby could be determined by parallax, enabling the determination of its intrinsic brightness based on its brightening - dimming schedule.

Then, using nearby Cepheids» intrinsic brightness, the bright - dim period for a more distant Cepheid could be used to infer its intrinsic brightness.

Type 1a supernova all seem to have the same intrinsic brightness, so their apparent brightness can be used to work out how far away they are.

The team has also found evidence to silence a minority of sceptics who argue that what most astronomers take to be microlensing events are actually caused by natural variations in the intrinsic brightness of the stars being observed.

So once the temperature and size of the expanding shell of the supernova are known, the supernova's intrinsic brightness can be calculated.

This property can be used to reveal the distance to a Cepheid's parent galaxy, because the star's period reveals its intrinsic brightness.

The distant galaxies have the same mass as nearby LSBs, the same color — they are blue, presumably because they contain young stars — and the same intrinsic brightness.

The observations are collated and then electronically published, along with an estimate of the object's orbit and intrinsic brightness.

Intrinsic brightness is a determination of how bright an object would be if observed at a common distance, eliminating the fact that a bright star can seem dimmer if it is far away and a dim star can seem brighter if it is close.

The intrinsic brightness of brown dwarfs, particularly cool brown dwarfs, is poorly known, but this key parameter can only be determined once an object's distance has been measured.

The intrinsic brightness of a blue horizontal - branch star can be estimated from its colour.

Getting a precise determination of mass is critical to understanding a star's temperature, diameter, intrinsic brightness, and longevity.

And the 1981 observations were made in several colours, all of which showed the same pattern of change — which rules out fluctuation in the star's intrinsic brightness, as this would vary with colour.

Type Ia supernovae, another commonly used cosmic yardstick, are exploding stars that flare with the same intrinsic brightness and are brilliant enough to be seen from much longer distances.

By simply measuring the period with which the brightness of a Cepheid rises and falls, the relation can be used to determine its luminosity, the intrinsic brightness of the star.

In practise, of course, the candles are replaced by stars or other objects which are thought to be the same intrinsic brightness.

Twenty years later, scientists noticed that type Ia supernovae — dying stars that all have the same intrinsic brightness — were farther away from our galaxy than they should have been.

The first kind, called «type Ia» (pronounced as «one a») is special because the intrinsic brightness of each of these supernovae is almost the same.

The sun's absolute magnitude (its intrinsic brightness) is +4.83.

SN 2006gy had a luminosity (or intrinsic brightness) equal to that of some 50 billion suns — around 10 times brighter than host galaxy NGC 1260 — before beginning a slow decline.

«Belonging to the essential nature or constitution of a thing... (the intrinsic brightness of a star).»