there are two separate ways that astronomers measure the brightness of a start, there is actuall and aparent brightness. In apparent brightness, the measure how bright it looks to all the humans on Earth. However, the actual brightness of a star is different. Say a star is really, really bright, but really far away. That star would look preety dim. Or if a star is not so bright, but really close, like the Sun. The actuall brightness of a star is harder to measure, but is possible by use of waves and stuff like that, I don't know too much about actuall brightness
If you mean the methods used, they are all quite indirect. The results of different observations are combined to get the information about the stars. You can't, for example, take a thermometer to the star; nor can you directly apply a measuring rod to the star.
Brightness of stars (apparent and absolute magnitude) is measured by convention, taking another star as a standard.
The scale called "apparent magnitude" is the usual measure.
It is a scale comparing the apparent brightness of stars, as seen from Earth.
In astronomy, the unit of brightness, or luminosity is the amount of energy radiated per unit of time. In SI terms, this is joules per second, or watts.
Absolute magnitude.
Solar radii.
One Suns' radius.
In units of measure(:
What metric unit would you use to measure a computer keyboard
A kilometre is a measure of distance. A millilitre is a measure of capacity. The two units are therefore incompatible.
Fluid ounces are a unit for capacity in an obsolete measurement system.
we answer quantities precisely by using measuring tools like rulers, and meter sticks :)
Units of measurement are useful to rationally measure anything.
Units of measurement provide a standard to measure mass, length etc.So, it is useful.
Both relate to brightness; both are measured in the same units; both are used for astronomical objects such as stars or galaxies.
In units of measure(:
base on what you measure to use the metric units.
They measure them in light-years.
Cubic units measure volume.
direct measurement and displacement
metric unit of measure for volume is mm cube .
to check the measure size
Tablespoon, teaspoon and ton are units of measurement. They begin with the letter t.
No, but if associated with some measurement units, it can be the measure of one side of a triangle.