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Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

A propulsive device that consists of a flat material (as aluminized plastic) designed to receive thrust from solar radiation pressure and that can be attached to a spacecraft.  2, record 2, English, - solar%20sail

Record number: 2, Textual support number: 1 CONT

This heliogyro solar sail is under consideration by NASA scientists for a 1968 Halley's Comet mission. Each sail blade may be over four miles long to capture propulsion energy from solar radiation.  3, record 2, English, - solar%20sail

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Surface aménagée pour capter dans l'espace l'énergie solaire (nécessaire à la propulsion d'un véhicule spatial).  3, record 2, French, - voile%20solaire

Record number: 2, Textual support number: 1 OBS

On s'intéresse beaucoup à cette méthode actuellement aux États-Unis où les techniques de «voiles solaires» sont très à la mode à la NASA, et, singulièrement, pour les vols lointains.  3, record 2, French, - voile%20solaire

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

An interesting numerical technique (for the purpose of graphical characterization) is Halley’s method.  1, record 3, English, - Halley%26rsquo%3Bs%20method

Record number: 3, Textual support number: 2 CONT

... Halley's method is in a class of algorithms that begins with a guess. The iteration is supposed to lead to a better guess, and the process is repeated. Halley's method behaves like a comet torn between conflicting tugs of two nearby planets. In some cases it might be difficult to determine which of the two nearby planets a comet will collide with even though we know the gravity equations.  1, record 3, English, - Halley%26rsquo%3Bs%20method

Record 3,  Textual support,  French

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

The Unit's interests in dust and comets were combined when the Giotto mission to Halley's comet in 1986 provided the opportunity to measure the dust density and mass distribution by attaching acoustic sensors to the spacecraft's bumper shield. DIDSY(Dust Impact Detection System) was developed and built by the Unit.  2, record 4, English, - dust%20impact%20detection%20system

Record 4,  Textual support,  French

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

of short-period comets, 93% move direct round the sun [Halley's Comet is one of the few with retrograde motion].  1, record 5, English, - retrograde%20motion

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 CONT

dans les trois cas le mouvement s'effectuait dans le sens rétrograde, contraire à celui de la révolution des planètes.  1, record 5, French, - mouvement%20en%20sens%20r%C3%A9trograde

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  French

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 CONT

there are other giant planets, each with a family of comets. For example, Halley's comet belongs to Neptune's family of comets.  1, record 7, English, - family%20of%20comets

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 CONT

on a parlé aussi d'une famille de comètes dont la distance aphélie serait en rapport avec l'orbite de Saturne.  1, record 7, French, - famille%20de%20com%C3%A8tes

Record 7,  Textual support,  Spanish