Branch Education – With Starlink internet, data is continuously being sent between a ground dish and a Starlink satellite orbiting 550km above. Furthermore, the Starlink satellite zooms across the sky at 27,000km/hr! How can the dish and satellite maintain a continuous connection? And then how is data sent back and forth? Well, in this video we're going to dive into the inner workings for the ground dish and Starlink satellites, and see how a beam of data is formed, how this beam is swept across the sky, and then finally what exactly is in that beam that allows for incredibly fast internet! This is an incredible feat of technology and engineering, so stick around!

Sabins – Let's understand what is universal law of gravitation and how Sir Isaac Newton discovered it in detail.

Clarity of Concept – This video explains the difference between geostationary orbit, geosynchronous orbit and polar orbits.

Veritasium – The Event Horizon Telescope Collaboration observed the supermassive black hole at the center of M87, finding the dark central shadow in accordance with General Relativity, further demonstrating the power of this 100 year-old theory.

sternen welten – Different orbits serve different purposes. Each has its own advantages and disadvantages. There are several types of orbits: Polar, Sun Synchronous, Geosynchronous

xmphysics – Geostationary Satellite

xmphysics – Geostationary Orbit

Bozeman Science – In this video Paul Andersen explains why astronauts are weightless. He also explains how Newton's Universal Law of Gravitation can be used to calculate the gravitational force between objects.

SciShow Space – SciShow Space takes you into Low Earth Orbit to explain how artificial satellites get up there and stay there -- at least for a while.

Alexander C – A geostationary orbit is directly above the Earth's equator, with a period equal to the Earth's rotational period and an orbital eccentricity of approximately zero. Geostationary objects appear motionless in the sky, making such orbits of great interest to operators of communications and weather satellites.

Veritasium – In this segment I ask 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.

Khan Academy – Why do astronauts appear weightless despite being near the Earth?

Fizzics Organisation – The orbits of geostationary and polar satellites are illustrated and explained in this short video.