But because only the flames are blue, rather than the lava itself, the effect is only visible at night—during daytime, the volcano looks like roughly any other.
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Lava is indeed very hot, reaching temperatures of 2,200° F or more. But even lava can't hold a candle to the sun! At its surface (called the photosphere), the sun's temperature is a whopping 10,000° F! That's about five times hotter than the hottest lava on Earth.
Once lava begins to harden it can turn into a variety of shapes and colors. The color of lava depends on the temperature of the flow as well as the chemical composition and any impurities that are in the liquid rock. Colors can include black, red, gray, brown and tan, metallic sliver, pink, and green.