Yes, it is a natural process for planets to gradually move closer to the sun over time. This is due to the conservation of angular momentum, which causes a planet's orbit to slowly decay.
The amount of time it takes for a planet to orbit closer to the sun varies depending on the planet's size, distance from the sun, and other factors. Generally, it can take millions of years for a significant change in a planet's orbit to occur.
Yes, Earth's orbit is slowly decaying, which means it is getting closer to the sun over time. However, this process is so gradual that it will not significantly affect life on Earth for millions of years.
No, the sun is not moving closer to other planets. It is actually the other way around - planets are moving closer to the sun. This is due to the gravitational pull of the sun, which causes planets to gradually spiral inward.
No, the sun will not consume all the planets in our solar system. While it is true that the sun's expansion will eventually engulf Mercury and Venus, Earth's orbit will likely move outwards as the sun loses mass and becomes less gravitationally powerful. This means that Earth will most likely survive the sun's expansion and become a "hot Jupiter" type planet.