There is no temperature in vacuum space, because there is no matter in vacuum space.

There is no EM wave/light/photon/energy in vacuum space, because there is no matter in vacuum space to carry EM wave/light/photon/energy.

There is no fabric of space and time, because there is no matter in space and time to make fabric.

The sun's energy is from star formation, not from on going fusion reaction. The sun's energy cannot radiate into empty space but matter. Energy must co-exist with matter.

Between any two masses/matters at distance r, exist two kinds of forces. Gravity between the two masses is F=G x m1m2/rr. Repulsion force between lines of sight electrons on the surface of the two masses is F=Ke x ee/rr. That repulsion force between matters is the conductor of radiation/light/EM wave/photon/energy.

The sun's energy/radiation circles around the Earth, no energy can radiate into space. The sun does not produce new energy from fusion reaction. The sun only shares its formation energy with matters around it through radiation.

Light speed/radiation speed in vacuum space is infinite, because the repulsion force between line of sight electrons is inherited, always existed, no matter at any distance. Sun light/radiation does not travel at light speed to Earth but instantaneously reaches Earth outer atmosphere, then travels in air at light speed. NASA lied about space communication at light speed.

Gravity is co-existed with matters, therefore it is instantaneous, LEGO lied about detected gravity wave from black holes merged 1.3 billion years ago. Gravity must be instantaneous, otherwise no planets can have stable orbit.

Light wave can only exist with matter/medium/water/air/glass. Do a new double slit experiment in vacuum, light will not show wave property but act as particle, there will be only two bright lines behind slits on the screen.

Measure light speed in a vacuum container, it will be instantaneous. You can use this tool.