Telstar and the First Live Pictures Across the Sea
Imagine turning on a television set in New York and watching a live baseball game, or tuning in from Paris to see a singer performing in London at that very moment. Today, streaming video from anywhere in the world feels completely normal. However, in the early 1960s, sharing live television across an ocean was an unsolved puzzle. Radio waves could carry voices across long distances, and undersea cables carried telephone calls, but television required far more information. Because Earth curves like a giant ball, television signals travel in straight lines and shoot right off into outer space instead of bending around the planet.
To bridge this ocean gap, engineers designed a beach-ball-sized machine named Telstar 1. Launched into space on July 10, 1962, Telstar was not the first satellite ever built. Other spacecraft, such as Sputnik and Explorer 1, had already orbited the planet to study space and test rocket technology. Telstar was special for a different reason: it was built to act as an active communications relay, catching signals from one continent and bouncing them down to another.
- undersea cables:
- Thick wires laid beneath the ocean floor to carry electronic messages between continents.
- relay:
- A device or system that receives a signal and passes it along to another location.
- uplink:
- The transmission of a radio or television signal from a ground station up to a satellite.
- downlink:
- The transmission of a signal from a satellite back down to a receiving station on Earth.
- frequency:
- The specific rate at which a radio wave vibrates, used to separate different signals.
- low Earth orbit:
- A path around the planet that is relatively close to Earth's surface.
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Main Idea
Identify the central idea and explain how important details develop it.
Context Clues
Use clues in the passage to work out what words mean. A separate printable Vocabulary worksheet is also available.
Summarize
Select, organize, and restate the most important information without adding opinion.
Purpose
Analyze what the author aims to do and how choices serve audience and purpose.
Structure
Analyze how sections and organizational choices build the text's ideas or effects.
Vocabulary
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Writing Prompts
Use the passage as a springboard for short written responses, from personal reflection to evidence-based arguments.
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Preview questions from this passageShowHide
- 1Why could television signals not easily travel across the ocean before Telstar was launched?
- 2How was Telstar 1 different in purpose from earlier satellites like Sputnik and Explorer 1?
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About this explanatory article passage for Upper Elementary
“Telstar and the First Live Pictures Across the Sea” is a explanatory article reading passage about Telstar and Satellite Communications, written for Upper Elementary. It takes about 3 minutes to read (513 words) and comes with an interactive quiz and a printable worksheet with comprehension questions and an answer key.