Overall, what is our most accurate technique for measuring the distance to a nearby star?

Tungsten-filament lightbulb emits light based on the temperature of the filament. which phenomenon does this demonstrate?

When an object is heated it contracts. a. true b. false

An ideal polarizer with its transmission axis rotated 30 degrees to the vertical is placed in a beam of unpolarized light of intensity 10w/m^2. after passing through the polarizer, what is the intensity of the beam? a. 8.7 w/m^2 b. 7.5 w/m^2 c. 5.0 w/m^2 d. 10 w/m^2 e. 2.5 w/m^2