Humans have sent various kinds of spacecraft-including flybys, orbiters, and landers-to all of t

Humans have sent various kinds of spacecraft-including...

Key Concepts

Flyby Missions

Flyby missions involve spacecraft that pass near a celestial target without entering orbit. They are advantageous due to their lower cost, simpler mission profiles, and the ability to visit multiple targets on a single mission. However, their short encounter times limit the amount and resolution of data that can be collected, reducing opportunities for extended study compared to other mission types.

Orbiter Missions

Orbiter missions require a spacecraft to enter orbit around the target body, allowing for prolonged observations, detailed mapping, and repeated measurements over time. This extended presence enables comprehensive studies of the planet's atmosphere, surface, and magnetic environment. The trade-offs include higher mission complexity, greater fuel requirements for orbital insertion and maintenance, and increased susceptibility to harsh planetary conditions.

Lander Missions

Lander missions are designed to touch down on the surface of a celestial body, providing the opportunity to conduct in-situ analyses of the planet's composition, geology, and environmental conditions. This direct interaction can yield high-quality, localized data that orbiters or flybys cannot. However, the challenges include the technological difficulties of safe entry, descent, and landing, as well as limited operational lifetimes and increased risks due to surface hazards.

Transcript

00:01 Question 26 is asking us about the varying types of missions we have sent to the other planets, and asking us to label the advantages and disadvantages, or as i'm going to call them, pros and cons of each type of mission.

00:18 The first type of mission that we'll look at is a flyby mission, which is often the first type of mission we plan for a visit to another world.

00:28 Now, a flyby basically is a type of spacecraft that approaches a planet or other celestial body, and then continues right on by it, either to travel to another planet or other celestial body, or to leave the solar system entirely.

00:46 So they're temporary visitors.

00:49 Because these spacecrafts only pass by planets or other worlds, they are less costly, and they are easier to design than an orbiter or a lander.

01:03 And they also don't require as much fuel to operate, and i'll explain why that is.

01:12 Another advantage of a fly -by mission is that it can fly -by more than one object using a planet's gravity.

01:20 This is what we call a gravitational assist.

01:23 So that doesn't require as much fuel because a planet's gravity can give the spacecraft a bit of a push in the right direction onward to its next target.

01:33 Because flybys can only do one quick pass by a planet or other object, their observation times are limited, so they may not be able to fully map the object in detail.

01:48 Another disadvantage is if they're planning on visiting more than one target, they have to be at just the right distance from a planet or other world in order to get the right gravitational boost from it.

02:01 Too close or too far away from a planet, and the spacecraft will either get too much of a gravitational boost or not enough of one.

02:10 Or in the case of flying too close to the planet, they could actually end up spiraling into it.

02:16 In addition, there's the matter of planetary alignment in flying by multiple planets.

02:23 The planets need to be in the right position in the orbit around the sun in order for the spacecraft to successfully bypass them in the right manner...

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