* The atmosphere doesn't have a clear boundary: It gradually thins out the higher you go.
* Escape velocity is different: That's the speed needed to permanently leave Earth's gravity, and it's about 11.2 km/s (25,000 mph).
* Orbital velocity is another factor: For a spacecraft to stay in orbit, it needs to achieve a specific speed depending on its altitude.
What matters is reaching a high enough altitude:
* Around 100 km (62 miles): This is often considered the "Kármán Line" and is the generally accepted boundary of space. Spacecraft often reach this altitude on their way to orbit.
* Above 160 km (100 miles): The atmosphere is thin enough for most spacecraft to experience very little drag, and they can achieve orbit.
So, while there's no magic speed, here's what's relevant:
* Initial acceleration: Spacecraft need powerful rockets to push through the thick lower atmosphere.
* Final orbital speed: To stay in orbit, a spacecraft needs to achieve a specific speed based on its altitude. This speed is lower than escape velocity.
* Reaching sufficient altitude: This is the key to minimizing atmospheric drag.
Let me know if you'd like more detail on any of these aspects!
