If the Sun were to suddenly explode, the consequences for Earth and all life on it would be catastrophic. However, the exact sequence of events and the timeline of our demise would depend on various factors, such as the distance of the Earth from the Sun at that time and the energy released by the explosion.
Here is a general overview of what would likely happen:
Initial Blast: The explosion of the Sun would release an enormous amount of energy in the form of light, heat, and radiation. This initial blast would travel at the speed of light, so we would receive no advance warning of the event.
Lack of Solar Radiation: With the Sun gone, there would be an immediate absence of sunlight reaching Earth. This would result in a sudden drop in temperature and a loss of the primary source of energy that sustains life on our planet. Photosynthesis would cease, disrupting the food chain and causing widespread ecological collapse.
Gravitational Effects: The Sun's explosion would also disrupt the gravitational forces that hold the planets in their orbits. The precise consequences of this disruption are complex and depend on various factors. It is possible that Earth could be flung out of its current orbit, sending it spiraling into space or causing it to collide with other celestial bodies.
Supernova Effects: When a star explodes in a supernova, it releases a tremendous amount of high-energy particles and radiation. If the Sun were to undergo a supernova-like explosion, these effects could have devastating consequences for life on Earth. The release of intense radiation would be lethal, causing widespread radiation sickness and genetic damage.
Timeframe: The exact timeline of our demise in such a scenario is difficult to predict without specific details about the nature of the explosion. However, it is safe to say that the consequences would be immediate and catastrophic. The timescale of our survival would likely be measured in minutes, hours, or, at most, days.
Given the extreme nature of such an event, it is unlikely that we would have any significant notice before our impending demise. The effects of the Sun's explosion would be swift and overwhelming, leaving little time for human perception or reflection.