Could humans survive if the Sun disappeared?

Probably not as a species in any ordinary sense, though a small number of humans might survive for some time in protected, powered habitats.

If the Sun suddenly disappeared, Earth would keep moving for about 8.5 minutes before the loss of sunlight and the Sun’s gravity were felt here. After that, the planet would go dark and begin freezing.

What would happen:

• Surface temperatures would plunge quickly, and most people exposed on the surface would die.
• Photosynthesis would stop, so crops and most food webs would collapse.
• The oceans would start freezing from the top down, but deep water could remain liquid for a long time under the ice, especially where geothermal or hydrothermal heat exists.
• With no sunlight, most of the planet would eventually become far too cold for life at the surface.

Could humans survive?

• A limited number might survive temporarily in sealed underground or underwater facilities using nuclear, geothermal, or other independent power.
• But an open, global human civilization would collapse very fast.
• Long-term, multi-generational survival would be extremely difficult, so human extinction would be a serious possibility.

So the short answer is: a few humans might survive for a while, but humanity as a whole would almost certainly not remain intact.