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Explain how a red star can be more luminous than a bluish-white star?
A red star can be more luminous than a bluish-white star if it is larger in size and/or hotter in temperature. The luminosity of a star is determined by its size and temperature, with larger and hotter stars emitting more energy. Therefore, a red star that is larger and hotter than a bluish-white star can be more luminous.
How much more luminous than the sun is the star Rigel?
Rigel is approximately 120,000 times more luminous than the Sun. It is a blue supergiant star, which is much larger and hotter than our Sun, resulting in its high luminosity.
What are the biggest and brightest stars called?
The biggest and brightest stars are called supergiants. These stars are much larger, hotter, and more luminous than our Sun. Examples of supergiants include Betelgeuse and Rigel in the constellation Orion.
Why do the giants have more moons than the terrestrial planets?
They are larger and so they have more gravity.
How can Arcturus be cooler and more luminous than the Sun?
Arcturus is cooler and more luminous than the Sun because it is a giant star, which means it has exhausted the hydrogen fuel in its core and expanded, causing its surface temperature to be lower than the Sun's but its overall size and brightness to be greater. This combination of lower temperature and larger size results in Arcturus being cooler and more luminous than the Sun.
How can a cool star be more luminous than a hot star?
Luminosity is related to temperature and distance.A cool and thus less luminous star would be brighter than a more luminous star at a greater distance.Our Sun is a relatively cool star in comparison to say Rigel, but because it is closer it appears more luminous and brighter.
Why do these gas giants have more moons than the terrestrial planets?
They are larger and so they have more gravity.
How do white dwarfs compare to super giants in terms of temperature and luminousity?
White dwarfs are typically much hotter than super giants, with surface temperatures ranging from about 5,000 to over 100,000 Kelvin, while super giants have surface temperatures between 3,500 and 20,000 Kelvin. However, despite their higher temperatures, white dwarfs are far less luminous than super giants, which can be thousands to millions of times more luminous than the Sun due to their massive sizes and energy output. In summary, white dwarfs are hotter but less luminous compared to super giants.
What are the mian characteristic of the gas giants?
they are much larger and more massive than earth and they do not have solid surfaces.
Which star is more luminous R136a1 or VY Canis Majoris?
R136a1 is the most luminous at about 8,700,000 times more than the Sun. VY Canis Majoris is only 450,000 times more luminous than our Sun.
Are blue stars more luminous?
Blue stars are more luminous than other main sequence stars but not necessarily brighter than giant and supergiant stars.
What is a bright giant?
A bright giant is a class of star that don't quite make it into the supergiant class but are much more luminous than giants.Eg. Epsilon Canis Majoris (Adhara): a blue-white (B-type) bright giant
