Meaning: 'Trajectory' means the path followed by an object moving through space, especially in relation to its flight or travel.

Wrong options:

• line: The word 'line' is too vague and does not specifically refer to a path in space, making it unsuitable in this context.
• path: While 'path' could refer to a route, it lacks the technical specificity of 'trajectory' in aerospace terminology.
• track: The term 'track' generally refers to a course or path but is more commonly used in contexts like racing or monitoring, rather than the precise movement of spacecraft.

Correct answer: contracts

Explanation: The word 'contracts' is the correct choice as it refers to formal agreements between parties, which fits the context of SpaceX's arrangements with NASA. It is a noun that aligns with 'resupply,' indicating the nature of the agreements being discussed.

Meaning: 'Contracts' are legally binding agreements between two or more parties, in this case, between SpaceX and NASA for resupply missions.

Wrong options:

• deals: The term 'deals' is informal and does not convey the legal binding nature of the agreements as effectively as 'contracts.'
• connect: 'Connect' is a verb and does not fit grammatically as a noun in this context, making it unsuitable.
• relate: 'Relate' is also a verb and does not fit the grammatical structure needed here, as it does not refer to an agreement.

Correct answer: take

Explanation: The word 'take' is the correct verb choice here, as it indicates the action of the spacecraft during landing. It fits grammatically in the phrase 'allow the craft to take a safe landing,' where 'take' is used to describe the act of achieving a landing.

Meaning: 'Take' in this context means to achieve or execute a landing successfully.

Wrong options:

• make: While 'make' could imply creating a landing, it is less commonly used in this context compared to 'take,' which is more standard in aviation terminology.
• have: The word 'have' does not convey the action of landing and is grammatically incorrect in this context, as it does not fit the structure of the sentence.
• with: 'With' is a preposition and does not function as a verb in this context, making it grammatically incorrect.

Correct answer: than

Explanation: The word 'than' is used for making comparisons, which is essential in this context to compare the speed of interplanetary missions to that of orbital flights. It fits grammatically as a conjunction that introduces the comparative clause.

Meaning: 'Than' is used to compare two things, indicating that interplanetary missions require faster launches compared to orbital flights.

Wrong options:

• that: 'That' is a conjunction used for defining or introducing clauses, but it does not serve the comparative purpose needed here.
• there: The word 'there' is an adverb indicating a place, which does not fit the grammatical structure of comparison in this context.
• these: 'These' is a demonstrative pronoun and does not serve the comparative function required in the sentence.