Why GO Into Space?
Why are companies lining up ON EARTH to send experiments into SPACE?
In this segment, Dr. Derek Mueller, asks why astronauts in the space station are weightless. The most common answer is because there is no gravity in space. But of course there is gravity in space, especially where the space station is located (only about 400km from Earth's surface). So astronauts still experience a gravitational pull - it's just that they and the space station are in free fall so they are accelerating together towards the Earth. The space station doesn't crash into the Earth because of its orbital velocity - it's going 28,000 km/h so as it falls, the Earth curves away from it. Source: Veritasium
You've probably seen beautiful photos of Earth and the other planets in our solar system. Those photos were often captured by spacecraft – robotic explorers doing their work far away from Earth. But how exactly do we send these spacecraft so far away? Well, it all starts with a rocket.
Comprehension Questions:
1. True or False: A rocket needs to get going to 17,500+ MPH to thrust into Earth’s atmosphere and stay in orbit.
2. An object in space that orbits around a large object is called a ___________.
3. What is the name of the circular path that satellites follow around Earth?
4. The balance of forward momentum (at over 17,000 mph) and _________ can keep a satellite in orbit for many years. Source: NASA Space Place