What is the difference between apparent brightness and absolute brightness?

What is the difference between apparent brightness and absolute brightness?

A star's apparent brightness is its brightness seen from Earth. A star's absolute brightness is the brightness the star would have if it were at a standard distance from Earth. What is the difference between absolute magnitude and apparent magnitude? … Light years are used to measure distances between stars.

What is the hottest star color?

Just for comparison, our Sun, which actually looks white from space, measures about 6,000 Kelvin. The hotter the star, the further up the spectrum you go. The hottest stars are the blue stars. A star appears blue once its surface temperature gets above 10,000 Kelvin, or so, a star will appear blue to our eyes.

What is the brightest star?

The brightest star in the sky is Sirius, also known as the “Dog Star” or, more officially, Alpha Canis Majoris, for its position in the constellation Canis Major. Sirius is a binary star dominated by a luminous main sequence star, Sirius A, with an apparent magnitude of -1.46.

What affects a star’s brightness?

As the size of a star increases, luminosity increases. If you think about it, a larger star has more surface area. That increased surface area allows more light and energy to be given off. Temperature also affects a star's luminosity.