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Off on a Comet

Off on a Comet is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Off on a Comet rather than just read about it. In short: Off on a Comet (French: Hector Servadac) is an 1877 science fiction novel by French writer Jules Verne. It recounts the journey of several people carried away by a comet contacting the Earth.

Off on a Comet — main illustration
Off on a Comet — illustration

Key takeaways

  • Off on a Comet belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Off on a Comet to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Off on a Comet from memory before moving on to harder problems.

Reference excerpt

Off on a Comet (French: Hector Servadac) is an 1877 science fiction novel by French writer Jules Verne. It recounts the journey of several people carried away by a comet contacting the Earth. The comet passes by various bodies in the Solar System before returning the travelers to the Earth.

Synopsis

The story starts with a comet called Gallia, that touches the Earth in its flight and collects a few small chunks of it. The disaster occurs on January 1 of the year 188x in the area around Gibraltar. On the territory that is carried away by the comet there remain a total of 36 people of French, English, Spanish and Russian nationality. These people do not realize at first what has happened, and consider the collision an earthquake. They first notice weight loss: Captain Servadac's adjutant Ben Zoof, to his amazement, jumps 12 m (39 ft) high. Zoof with Servadac also soon notice that the alternation of day and night is shortened to six hours, that east and west have changed sides, and that water begins to boil at 66 °C (151 °F), from which they rightly deduce that the atmosphere became thinner and pressure dropped. At the beginning of their stay in Gallia they notice the Earth with the Moon, but think it is an unknown planet. Other important information is obtained through their research expedition with a ship, which the comet also took. During the voyage they discover a mountain chain blocking the sea, which they initially consider to be the Mediterranean Sea and then they find the island of Formentera (before the catastrophe a part of the Balearic Islands), where they find French astronomer Palmyrin Rosette, who helps them to solve all the mysterious phenomena. They are all on a comet which Rosette discovered a year ago and predicted to be on a collision course with Earth, but no one believed the astronomer, because a layer of thick fog at the time prevented astronomical observations in other places. A new research expedition determines the circumference of Gallia to be 2,320 km (1,440 mi). The mass of the comet is calculated by Rosette. He determines it at 209,346 billion tonnes. For the calculation he uses spring scales and forty 5-franc silver coins, the weight of which on earth equaled exactly 1 kg (2.2 lb). However, the owner of the scales, Isaac Hakkabut, has rigged the instrument, so the results have to be cut by a quarter. The involuntary travelers through the Solar system do not have any hope for long-term colonization of their new world, because it is lacking arable land. They feed themselves mainly with the animals that were left on the chunk carried away by Gallia. One strange phenomenon they meet is that the sea on the comet does not freeze, even though the temperature drops below the freezing point (believed to be due to the theory that a stagnant water surface resists freezing longer than when rippled by wind). Once a stone is thrown into the sea, the sea freezes in a few moments. The ice is completely smooth and allows skating and sleigh sailing. Despite the dire situation in which the castaways find themselves, old power disputes from Earth continue on Gallia, because the French and English officers consider themselves the representatives of their respective governments. The object of their interest is for example previously Spanish Ceuta, which has become an island on the comet and which both parties start to consider an unclaimed territory. Captain Servadac therefore attempts to occupy Ceuta, without success. It turns out that the island has been occupied by Englishmen, who maintain a connection to their base at Gibraltar through an optical telegraph. Gallia gets to an extreme point of its orbit and begins its return to Earth. In early November Rossete's refined calculations show that there will be a new collision with the Earth, exactly two years after the first, again on January 1. Therefore, the idea is conceived of leaving the comet at collision time in a balloon. The proposal is approved and the castaways make a balloon out of the sails of their ship. In mid-December there is an earthquake, in which Gallia partially falls apart and loses a fragment, which probably kills all Englishmen in Ceuta and Gibraltar. When on January 1 there is again a contact between the atmospheres of Gallia and Earth, the space castaways leave in the balloon and land safely two kilometers from Mostaganem in Algeria.

Main characters The 36 inhabitants of Gallia include a German Jew, an Italian, three Frenchmen, eight Russians, 10 Spaniards, and 13 British soldiers. The main characters are:

Captain Hector Servadac of the French Algerian army Laurent Ben Zoof, Servadac's aide Count Wassili Timascheff of Russia Lt. Procope, the commander of Timascheff's yacht, Dobrina Isaac Hakkabut, a stereotyped Jewish trader Nina, a cheerful young Italian goatherd (girl). Pablo, a Spanish boy Colonel Heneage Finch Murphy and Major Sir John Temple Oliphant of Britain's Gibraltar garrison. In the French original Murphy is actually a Brigadier (General), a rank too high to be the butt of Verne's joking description as playing an interminable game of chess without a pawn being taken. The translator accordingly demoted him to the rank of Colonel, a rank less likely to cause offense. Palmyrin Rosette, a French astronomer and discoverer of the comet and previously Servadac's teacher.

… excerpt ends here. Continue reading the full article.

Illustrations

Off on a Comet illustration
Off on a Comet: John Herschel observes Comet Halley from his observatory in Cape Town in 1835 (illustration from the book).
John Herschel observes Comet Halley from his observatory in Cape Town in 1835 (illustration from the book).

Worked examples

Example 1 — a first encounter with Off on a Comet

Start with the simplest possible case. Write down what Off on a Comet claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Off on a Comet before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Off on a Comet ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Off on a Comet

In research
Off on a Comet appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Off on a Comet in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Off on a Comet is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1870s French-language novels, 1877 French novels, 1877 science fiction novels, so understanding it makes those chapters shorter.
In everyday life
Look for Off on a Comet outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Off on a Comet in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Off on a Comet means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Off on a Comet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Off on a Comet in simple terms?

Off on a Comet (French: Hector Servadac) is an 1877 science fiction novel by French writer Jules Verne. It recounts the journey of several people carried away by a comet contacting the Earth.

Why does Off on a Comet matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Off on a Comet?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Off on a Comet.

Tags

  • 1870s French-language novels
  • 1877 French novels
  • 1877 science fiction novels
  • Adventure novels adapted into films
  • Antisemitic novels
  • Ceuta
  • Fiction about comets
  • French adventure novels
  • French novels adapted into films
  • French science fiction novels
  • Novels about impact events
  • Novels by Jules Verne

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