Self-Assessment Quiz: The Future

Twenty questions on Artemis, Mars, commercial stations, tourism, asteroid mining, and the space economy. Because this chapter is about judgment as much as fact, several questions ask you to tier a claim or to tell the possible from the speculative. Answer each before opening the key. Aim for 16 or more. Use $g_0 = 9.81\ \text{m/s}^2$.

Question 1

The Artemis program is named for:

A) the first woman to fly in space B) the Greek goddess of the Moon, Apollo's twin sister C) an acronym for a NASA launch system D) the constellation the Moon passes through

Question 2

The Gateway is best described as:

A) a launch pad on the Moon B) a small crewed station in a near-rectilinear halo orbit around the Moon C) the crewed lunar lander D) a ground station for lunar communications

Question 3

The Human Landing System (HLS) is being provided to NASA primarily by:

A) NASA building it in-house B) a single international agency C) commercial companies (e.g., SpaceX Starship, Blue Origin) as a service D) refurbished Apollo Lunar Modules

Question 4

The single hardest problem of a crewed Mars mission, per §39.2, is:

A) the trajectory out B) the launch window C) the return trip D) communication delay

Question 5

A Mars mission plans to make its return propellant on Mars mainly because:

A) Earth propellant is chemically different B) bringing it from Earth would compound through the rocket equation at every leg C) methane cannot be stored for the trip out D) it is illegal to land fuel on Mars

Question 6

The Sabatier reaction on Mars combines Martian atmospheric $\mathrm{CO_2}$ with imported hydrogen to make:

A) oxygen and nitrogen B) methane and water C) ammonia and oxygen D) hydrogen peroxide

Question 7

The ISS is currently scheduled to be retired (de-orbited) around:

A) 2025 B) 2030 C) 2040 D) it will operate indefinitely

Question 8

The central risk to commercial space stations is:

A) the physics of building a pressure vessel B) launch is impossible without the Shuttle C) the business case — whether paying demand exists without NASA as anchor tenant D) they cannot be placed in orbit

Question 9

Suborbital tourism differs from orbital tourism most fundamentally in:

A) the color of the sky B) the sideways speed (and thus energy) required C) the number of passengers D) the launch site

Question 10

Roughly what factor separates the specific kinetic energy of orbital flight ($\sim 7.8\ \text{km/s}$) from a suborbital hop ($\sim 1\ \text{km/s}$)?

A) about 8× B) about 30× C) about 60× D) about 1,000×

Question 11

The near-term economic prize of asteroid mining is usually said to be:

A) platinum sold on Earth B) water, used as propellant in space C) gold for jewelry D) rare gases for balloons

Question 12

Bringing bulk platinum from an asteroid down to Earth's surface is a poor business because:

A) platinum is worthless B) the return delta-v is prohibitive and a large delivery would collapse the price C) asteroids contain no metals D) it is physically impossible to land anything on Earth

Question 13

The space economy today (a few hundred billion dollars a year) is dominated by:

A) rocket launches B) space tourism C) satellite services (communications, navigation, imaging) D) asteroid mining

Question 14

The ">$1 trillion by 2040" space-economy figure should be labeled:

A) Tier 1 — a verified measurement B) Tier 2 — an attributed projection from reputable analysts, not a measurement C) Tier 3 — a made-up number D) a physical constant

Question 15

The "master variable" the chapter says turns the possible into the probable is:

A) a new kind of fuel that beats the rocket equation B) the falling cost of launch, driven by reusability C) faster-than-light travel D) government funding alone

Question 16 (True/False, justify)

"Because suborbital tourism now flies routinely, cheap orbital tourism for ordinary people is only a few years away." True or false? Justify with the rocket equation.

Question 17 (True/False, justify)

"Artemis is essentially a repeat of Apollo." True or false? Name the architectural difference the word "sustained" captures.

Question 18 (Short answer)

The Gateway flies a near-rectilinear halo orbit rather than a low lunar orbit. Give the one-sentence physical reason it is cheap to hold, and the cost that choice pushes onto the lander.

Question 19 (Short answer)

Explain in one or two sentences why "we haven't gone to Mars because it's too far" is the wrong diagnosis, and name what the real obstacles are.

Question 20 (Short answer)

In your own words, connect the Voyager Grand Tour to the chapter's thesis about the future. What principle does it embody, and what does the future not get to do to the rocket equation?

Answer Key

Q Ans Note
1 B Artemis was Apollo's twin sister and goddess of the Moon.
2 B A small station in an NRHO (a halo orbit about Earth–Moon L2).
3 C HLS is bought as a commercial service (Starship, Blue Moon).
4 C Getting there is understood; the return is the crux.
5 B Bringing return propellant compounds through the rocket equation at launch, injection, and landing.
6 B $\mathrm{CO_2} + 4\mathrm{H_2} \rightarrow \mathrm{CH_4} + 2\mathrm{H_2O}$.
7 B ~2030 (attributed; a dedicated de-orbit vehicle is contracted).
8 C The engineering is proven; the economics is the open question.
9 B Sideways speed — orbit means going fast enough to miss the ground.
10 C $30\ \text{MJ/kg}$ vs $0.5\ \text{MJ/kg}$ ≈ 60×.
11 B Water → propellant, most valuable where it is mined.
12 B Return delta-v is prohibitive; a large delivery crashes the price.
13 C Satellite services dominate; launch is a small slice.
14 B A reputable projection, not a measurement — Tier 2.
15 B Falling launch cost (reusability, theme 5).
16 False The two live on opposite sides of the exponential (~1.5 vs ~9.4 km/s; ~35% vs ~94% propellant); progress in one says little about the other.
17 False Apollo used everything once and left nothing; Artemis builds persistent infrastructure (station, reusable landers, ISRU) — "sustained."
18 — The NRHO (an Earth–Moon L2 halo) needs only a few m/s/yr of station-keeping and sees Earth and the south pole continuously; the cost is more descent/ascent delta-v for the lander.
19 — The delta-v to Mars is only modestly more than to escape Earth; the real obstacles are the years of radiation and closed-loop life support and, above all, launching home from a world with no infrastructure.
20 — Voyager rode gravity assists (Ch. 11) and the natural dynamics (Ch. 15) — cooperating with the physics, with the audacity to outlast its builders; the future works with the rocket equation and cannot repeal it, only afford it better as launch cost falls.

Topics to review by question

Questions Topic Section
1, 2, 3, 17, 18 Artemis, Gateway, HLS, sustained presence §39.1
4, 5, 6, 19 Mars challenges, ISRU, the return trip §39.2
7, 8 Commercial space stations §39.3
9, 10, 16 Suborbital vs. orbital tourism §39.4
11, 12 Asteroid mining (value in space) §39.5
13, 14 The space economy and tiering projections §39.6
15, 20 The master variable; the Voyager coda §39.6