what are the top 10 tallest buildings in the world?
Here are the 10 tallest buildings in the world:

1. Burj Khalifa, Dubai, UAE - 828 meters (2,717 feet)
2. Merdeka 118, Kuala Lumpur, Malaysia - 679 meters (2,227 feet)
3. Tokyo Skytree, Tokyo, Japan - 634 meters (2,080 feet)
4. Shanghai Tower, Shanghai, China - 632 meters (2,073 feet)
5. Canton Tower, Haizhu District of Guangzhou (Canton), China - 604 meters (1,982 feet)
6. Makkah Royal Clock Tower, Mecca, Saudi Arabia - 601 meters (1,972 feet)
7. Ping An Finance Centre, Shenzhen, China - 599 meters (1,966 feet)
8. Lotte World Tower, Seoul, South Korea - 555 meters (1,819 feet)
9. One World Trade Center, New York City, USA - 541 meters (1,776 feet)
10. Guangzhou CTF Finance Centre, Guangzhou, China - 530 meters (1,739 feet)

Please note that this information might be outdated, as new buildings are continually being constructed and completed. It is recommended to check the most recent information for the current ranking of the tallest buildings in the world.
If you stacked all these buildings on top of each other, how close to the International Space Station would they be?
The height of these buildings stacked on top of each other would be 6,203 meters. The international space station currently orbits at a range between 390-410km.  They would be about 394 kilometers away from the international space station on average.