Can astronauts reach the sun?

With present technology, you can't go to the sun.

The thermal insulation material of the spacecraft can basically withstand below 2000℃, and it is hard to say if it is higher. The spacesuit can withstand the high temperature of several hundred degrees at most.

I don't know what method will be used in the future, but it is estimated that it is not feasible and necessary to send people to the sun, and it is likely to be sent to a temperature-resistant machine.

The sun is a plasma gas planet, which has no clear surface and cannot land.