๐คท Something to figure out or answer is, how a rock from asteroid belt propel towards earth. What causes it come our way? That one rock wiped out dinosaurs.
๐คท This is what is happening. But the question is Why is it happening only to mercury but not earth?
๐️ Research on Vulcan planet. It's hypothetical
๐ You may find clue for mercury
๐คฏ That was one of the theory before Einstein
๐ Vulcan planet
https://phys.org/news/2008-10-solar-young-twin-asteroid-belts.amp
https://science.howstuffworks.com/asteroid-belt.htm
https://www.universetoday.com/130136/far-asteroid-belt-earth/amp/
https://wisp.physics.wisc.edu/astro104/lecture19/lec19g.html
http://www.cbat.eps.harvard.edu/special/rocknroll/0003834.html
The first minor planet to be discovered was Ceres in 1801, though it was called a 'planet' at the time and an 'asteroid' soon after; the term minor planet was not introduced until 1841, and was considered a subcategory of 'planet' until 1932.
https://en.wikipedia.org/wiki/Minor_planet#:~:text=The%20first%20minor%20planet%20to,of%20'planet'%20until%201932.
*Noted*
Uranus is slightly larger in diameter than its neighbor Neptune, yet smaller in mass. It is the second least dense planet; Saturn is the least dense of all.
Notes for Vulcan Planet:
The idea of Vulcan as a planet that existed between the sun and Mercury was proposed between 1859 and 1915 to explain anomalies in Mercury's orbit.
The International Astronomical Union still reserves the name "Vulcan" for the hypothetical planet and for any hypothetical asteroids that may exist within Mercury's orbit.
Mercury is denser than Venus because it has a larger metallic core and is made of heavier elements:
Density:
Mercury's density is 13.59 grams per cubic centimeter, while
Venus's average density is 5.2 grams per cubic centimeter.
Core:
Mercury's core is large and metallic, with a radius of about 1,289 miles (2,074 kilometers), which is about 85% of the planet's radius.
Elements:
Mercury is made of heavier elements than Venus.
Earth is the densest object in our solar system, even though it's made of lighter materials and has a substantial atmosphere. This is because Earth has enough mass to compress itself significantly due to gravity.