Protostars don't have a specific temperature in degrees like we measure on Earth. Their temperatures vary greatly depending on their stage of development and mass.

Here's what you need to know:

* Protostars are incredibly hot: They can reach temperatures of several thousand degrees Kelvin (K). This is because they are formed from the gravitational collapse of a giant cloud of gas and dust, causing immense friction and heat.

* Temperature changes over time: As a protostar evolves, its temperature increases as its core becomes denser and fusion starts to occur. This eventually leads to the formation of a star.

* Mass plays a role: More massive protostars are hotter than less massive ones.

To summarize, it's impossible to give a single degree measurement for a protostar. They are incredibly hot, but their temperature changes significantly throughout their evolution and depends on their size.