When determining the melting point of the alum, it is necessary to keep the thermometer next to the capillary tube to ensure that the temperature reading is accurate. True or false?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.