Sputnik 1 Trivia
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50 free Sputnik 1 trivia questions with answers — history quiz, new questions added Aug 2026.
On 4 October 1957 a polished aluminium sphere the size of a beach ball began beeping its way around the Earth every 96 minutes, and the world changed. Sputnik 1 was thrown together in months because the Soviets feared America would get there first, it ran on batteries that lasted just three weeks, and it burned up after 1,440 orbits. Yet it triggered the Sputnik crisis, the creation of NASA and DARPA, a rush of science funding in American schools, and even the idea behind GPS. This quiz covers the whole story: Sergei Korolev's design bureau, the R-7 rocket and its failed test flights, the satellite's design and radio frequencies, the reaction in Washington and around the world, Sputnik 2 and the dog Laika, and where the surviving backups sit today. It is written for space fans, Cold War history readers and anyone brushing up on the dawn of the Space Age; early questions are approachable, later ones ask for engineers' names and exact figures. Every answer was checked against Wikipedia's articles on Sputnik 1, Sputnik 2 and the Sputnik crisis, and each question carries the sentence that supports it. Our Space Race quiz picks up where this one ends.
30 of 50 questions with answers and explanations. Play the quiz
Q 01On what date was Sputnik 1 launched?
4 October 1957
Sputnik 1 lifted off on 4 October 1957 at 19:28 UTC; its beeps were confirmed on the first orbit and the Space Race had begun.
Q 02What was Sputnik 1's claim to fame?
First artificial Earth satellite
Sputnik 1 was the first artificial Earth satellite; its success in October 1957 caught the United States off guard and set off the Space Race.
Q 03What does the Russian word 'sputnik' literally mean?
Fellow-traveller
Sputnik means 'fellow-traveller' or travelling companion, built from s- (with) and put' (path); Russians also use it for a spouse, a companion in life.
Q 04What shape was Sputnik 1?
A polished metal sphere
The spherical body was deliberately chosen so atmospheric density could be worked out from how its orbit decayed.
Q 05How many external radio antennas did Sputnik 1 carry?
Four
Four whip antennas in two pairs, 2.4 and 2.9 metres long, gave an almost spherical radiation pattern so the signal reached the ground whatever way the satellite was pointing.
Q 06Roughly how big was Sputnik 1 in diameter?
58 cm
The polished aluminium-alloy sphere was 58 cm across, about the size of a beach ball, built from two hemispheres sealed with O-rings.
Q 07How much did Sputnik 1 weigh?
83.6 kg
Sputnik 1 weighed 83.6 kg; more than half of that, 51 kg, was the battery pack, shaped like an octagonal nut with the transmitter sitting in its hole.
Q 08For roughly how long did Sputnik 1 transmit its radio signal before the batteries died?
Three weeks
The silver-zinc batteries were expected to last two weeks and ran for about three weeks, the signal falling silent on 26 October 1957.
Q 09How long did each of Sputnik 1's orbits take?
96.2 minutes
Each orbit took 96.2 minutes; at a peak speed of about 8 km/s (18,000 mph) Sputnik circled the Earth roughly 15 times a day.
Q 10How many orbits of the Earth had Sputnik 1 completed when it burned up on 4 January 1958?
1,440
Sputnik 1 completed 1,440 orbits in its 92 days aloft; its batteries had died after about three weeks, so it circled silently for more than two months.
Q 11Who was the chief Soviet rocket scientist who proposed the satellite plan in 1954 and led the programme?
Sergei Korolev
Sergei Korolev, the Soviet chief designer, pushed the satellite idea from 1954 and on launch night waited about 90 minutes to be sure the sphere had completed an orbit.
Q 12Which rocket, originally designed as an ICBM, launched Sputnik 1?
R-7
The R-7, the world's first intercontinental ballistic missile, was the most powerful rocket of its day; a modified version designated 8K71PS put Sputnik 1 into orbit.
Q 13What did the letters "PS" in the project name Object PS stand for?
Prosteishiy (elementary) satellite
Q 21What did the intended orbit's apogee turn out to be compared with the plan?
About 500 km lower
A fuel regulator failed 16 seconds after launch; the engines ran rich and the core stage cut off a second early, leaving the apogee about 500 km lower than planned.
Q 22What did most people who "saw Sputnik" in the night sky actually see?
The 26-metre R-7 core stage
The tiny polished sphere was only sixth magnitude; the booster trailing behind it was first magnitude and had reflective panels fitted to make tracking easier.
Q 23Which British observatory was the only one able to track Sputnik's booster rocket by radar?
Jodrell Bank
The simple sphere replaced the heavy, instrument-laden Object D, which was running late and later flew as Sputnik 3.
Q 14The heavier, more ambitious Object D that the simple sphere replaced eventually flew under what name?
Sputnik 3
Object D flew as Sputnik 3 on 15 May 1958, a 1,327 kg orbiting laboratory; in 1957 its instruments were running late, so the simple sphere went first.
Q 15What was the launch site, later known as the Baikonur Cosmodrome, called at the time?
The 5th Tyuratam range
The remote proving ground was chosen in 1955 but not completed until 1958.
Q 16In which present-day country was Sputnik 1 launched?
Kazakhstan
The launch site was in the Kazakh Soviet Socialist Republic, at what is now Baikonur.
Q 17On which two frequencies did Sputnik 1 transmit?
20.005 and 40.002 MHz
Sputnik 1 transmitted on 20.005 and 40.002 MHz; its 0.3-second pulses alternated between the two bands, and a change in pulse length would have signalled temperature or pressure trouble.
Q 18What gas filled the sealed interior of Sputnik 1?
Dry nitrogen
The sealed sphere held dry nitrogen at 1.3 atmospheres; a barometric switch would have altered the beep pattern if a leak or meteoroid puncture dropped the pressure.
Q 19How was Sputnik's internal temperature kept in check?
A fan switched on above 36 °C
A dual thermal switch turned the fan off again below 20 °C.
Q 20How many R-7 launch attempts failed before the first fully successful flight in August 1957?
Three
The May flight caught fire at liftoff, the June rocket never left the pad, and the July vehicle rolled out of control and crashed 7 km away.
Jodrell Bank's 76-metre Mark I telescope, completed only that summer, was the one instrument in the world able to track the booster by radar in 1957.
Q 24Which citizen-science project organised teams of visual observers at 150 stations to watch for Sputnik?
Operation Moonwatch
Operation Moonwatch, run by the Smithsonian Astrophysical Observatory, had trained volunteer teams with small telescopes to spot satellites at dawn and dusk.
Q 25Which university's student radio station was the first to rebroadcast the beeps to the American public?
Columbia
Columbia University's amateur station W2AEE picked up the signal and students at the campus FM station WKCR taped and rebroadcast it, the first time most Americans heard the beeps.
Q 26Which US research agency was created in February 1958 in direct response to Sputnik?
ARPA (later DARPA)
NASA followed later the same year through the National Aeronautics and Space Act.
Q 27Which 1958 law, passed after Sputnik, offered low-interest college loans to maths and science majors?
National Defense Education Act
The National Defense Education Act of September 1958 poured federal money into maths, science and language teaching, including low-interest loans for college students.
Q 28What was the first successful American satellite, launched on 31 January 1958?
Explorer 1
Explorer 1 was built by the Army Ballistic Missile Agency and the Jet Propulsion Laboratory; its Geiger counter data led to the discovery of the Van Allen radiation belts.
Q 29Which American launch failed on live television on 6 December 1957, deepening the country's dismay?
Vanguard TV-3
Vanguard TV-3 rose about a metre before falling back and exploding on the pad at Cape Canaveral; the press dubbed it 'Flopnik' and 'Kaputnik'.
Q 30How had President Eisenhower been forewarned of the R-7's capabilities?
U-2 spy plane photos and intercepts
His administration's first response was low-key; he even welcomed the USSR testing the legality of satellite overflights first.