Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

Project Echo

Project Echo was a passive communications satellite experiment designed by the American National Aeronautics and Space Agency (NASA) as the first test of man-made satellite communication in history. Each of the two spacecraft, launched in 1960 and 1964, were metalized balloon satellites acting as passive reflectors of microwave signals. Communication…

Legacy, Spacecraft & Flights

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around Project Echo. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Apogee altitude
1,684 km (1,046 mi)
Bus
ECHO
Contractor
Douglas Aircraft Company
COSPAR ID
1960-009A
Decay date
25 May 1968
Dimensions
30.48 m (100.0 ft) diameter sphere when inflated

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Background

Ground stations

Spacecraft

Flights

Legacy

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Project Echo

Nodes78
Edges77
Triples84
Avg. degree1.97
Density0.025641
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

Project Echo

Top relations

related to Ground stations · 25
Project Echo → Both, Broad, California, Crawford Hill, Digital, East-to-west, Echo, Goldstone, Goldstone Dry Lake, Holmdel, Horn, JPL, Mojave Desert, NASA Minitrack, New Jersey, Optical, Pioneer, Radar, Satellite, Sun
related to Further reading · 17
Project Echo → AAS History Series, American Astronomical Society, Behind, Donald, Eight-Ball, Elder, History, Invention, ISBN, Nick D'Alto, Number, Out, Technology Summer, The Inflatable Satellite, Univelt, Vol, Volume
related to Legacy · 12
Project Echo → Because Echo, Bell Telephone Laboratories, Collins Radio Company, Echo, Holmdel, JPL Goldstone, Moscow, Naval Research, New Jersey, Other, The Echo, This
related to Echo 2 · 6
Project Echo → Echo, It, MHz, The, Therefore, This
related to Objectives · 2
Project Echo → Echo, Spaceflight
Apogee altitude · 1
Project Echo → 1,684 km (1,046 mi)
Bus · 1
Project Echo → ECHO
Contractor · 1
Project Echo → Douglas Aircraft Company
COSPAR ID · 1
Project Echo → 1960-009A
Decay date · 1
Project Echo → 25 May 1968

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

echo satellite communications used balloon project 1960 satellites passive first orbit spacecraft launch two using earth nasa ft system antenna

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Project EchoApogee altitude1,684 km (1,046 mi)1.00infobox
Project EchoBusECHO1.00infobox
Project EchoContractorDouglas Aircraft Company1.00infobox
Project EchoCOSPAR ID1960-009A1.00infobox
Project EchoDecay date25 May 19681.00infobox
Project EchoDimensions30.48 m (100.0 ft) diameter sphere when inflated1.00infobox
Project EchoHarvard designation1960 Alpha 111.00infobox
Project EchoInclination47.2°1.00infobox
Project EchoLaunch date12 August 1960, 03:39:43 GMT1.00infobox
Project EchoLaunch mass180 kg (400 lb)1.00infobox
Project EchoLaunch siteCape Canaveral, LC-17A1.00infobox
Project EchoManufacturerBell Labs1.00infobox
Project EchoMission duration7.75 years (achieved)1.00infobox
Project EchoMission typeCommunications1.00infobox
Project EchoNamesECHO 1 NASA A-111.00infobox
Project EchoOperatorNASA1.00infobox
Project EchoPerigee altitude1,524 km (947 mi)1.00infobox
Project EchoPeriod118.3 minutes1.00infobox
Project EchoReference systemGeocentric orbit1.00infobox
Project EchoRegimeLow Earth orbit1.00infobox
Project EchoRocketThor DM-19 Delta (Thor 270 / Delta 2)1.00infobox
Project EchoSATCAT no.000491.00infobox

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.