friction, they are going very fast through the atmosphere and it is generation a lot of heat
As the space capsule re-enters Earth's atmosphere, it experiences immense friction with the air, causing the exterior to heat up rapidly. This intense heat leads to the glow, heating up the exterior to temperatures hot enough to emit a red glow. Heat shields are used to protect the spacecraft and its occupants from these extreme temperatures.
It is glowing red hot because of the friction created between the space shuttle and the surrounding air.
The glow stick in the cold water will not glow as bright as the glow stick in the hot water because when you cool the glow stick down, the chemical process will slow down. The glow stick in the hot water will glow brighter but for a shorter period of time.
To revive a glow stick that has lost its glow, you can try placing it in hot water to help the chemicals inside mix again and potentially restore its glow.
To make a glow stick glow again, try placing it in hot water or shaking it vigorously to mix the chemicals inside. This may help reignite the glow.
To make glow sticks glow again, try placing them in hot water or in the freezer for a few minutes. This can help reactivate the chemicals inside the glow sticks and make them glow brighter.
Heat them, for example by briefly putting them in hot water. They will glow more brightly, but won't last as long.
It's Blackbody Radiation
Because they are extremely hot.
Any hot object will glow brighter when it is hotter.
To revive glow sticks and make them glow again, you can try placing them in hot water or using a hair dryer to heat them up. This can help reactivate the chemicals inside the glow sticks and restore their glow.
It depends on how quickly they enter. It's safe to say they get very hot. Most particles burn up as they enter and can be seen at night as "shooting stars" as they glow. When the space shuttle reentered earth's atmosphere it had to do so in a precise angle. If it entered too shallow it would bounce back into space. If it entered too steeply it would burn up. The heat is caused by the friction of the air passing over the object.