With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Twilight Saga stars Kristen Stewart as the lead role.
text_B: Absolute magnitude is a measure of the luminosity of a celestial object , on a logarithmic astronomical magnitude scale .. luminosity. luminosity. celestial object. celestial object. logarithmic. Logarithmic scale. astronomical magnitude. Magnitude ( astronomy ). An object 's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if were viewed from a distance of exactly 10 parsecs -LRB- 32.6 light years -RRB- , with no extinction -LRB- or dimming -RRB- of its light due to absorption by interstellar dust particles .. apparent magnitude. apparent magnitude. parsecs. parsecs. extinction. Extinction ( astronomy ). interstellar dust. Cosmic dust. By hypothetically placing all objects at a standard reference distance from the observer , their luminosities can be directly compared on a magnitude scale .. As with all astronomical magnitudes , the absolute magnitude can be specified for different wavelength ranges corresponding to specified filter bands or passbands ; for stars a commonly quoted absolute magnitude is the absolute visual magnitude , which uses the visual -LRB- V -RRB- band of the spectrum -LRB- in the UBV photometric system -RRB- .. magnitudes. magnitude ( astronomy ). wavelength. wavelength. filter. Filter ( optics ). UBV photometric system. UBV photometric system. Absolute magnitudes are denoted by a capital M , with a subscript representing the filter band used for measurement , such as MV for absolute magnitude in the V band .. magnitudes. magnitude ( astronomy ). filter. Filter ( optics ). The more luminous an object , the smaller the numerical value of its absolute magnitude .. A difference of 5 magnitudes between the absolute magnitudes of two objects corresponds to a ratio of 100 in their luminosities , and a difference of n magnitudes in absolute magnitude corresponds to a luminosity ratio of 100 -LRB- n / 5 -RRB- .. luminosity. luminosity. magnitudes. magnitude ( astronomy ). For example , a star of absolute magnitude MV = 3 would be 100 times more luminous than a star of absolute magnitude MV = 8 as measured in the V filter band .. filter. Filter ( optics ). The Sun has absolute magnitude MV = +4.83 .. Sun. Sun. Highly luminous objects can have negative absolute magnitudes  : for example , the Milky Way galaxy has an absolute B magnitude of about − 20.8 .. magnitudes. magnitude ( astronomy ). Milky Way. Milky Way. An object 's absolute bolometric magnitude represents its total luminosity over all wavelengths , rather than in a single filter band , as expressed on a logarithmic magnitude scale .. luminosity. luminosity. logarithmic. Logarithmic scale. filter. Filter ( optics ). wavelengths. wavelengths. To convert from an absolute magnitude in a specific filter band to absolute bolometric magnitude , a bolometric correction is applied .. filter. Filter ( optics ). bolometric correction. bolometric correction. For Solar System bodies that shine in reflected light , a different definition of absolute magnitude -LRB- H -RRB- is used , based on a standard reference distance of one astronomical unit .. Solar System. Solar System. astronomical unit. astronomical unit
not_related.