解析 A。“how much”除了询问数量,还可以询问“多少时间”,“how many”询问数量,后接可数名词复数;“how long”询问“多长时间”,通常用于对时间段的提问;“how often”询问频率。本句问的是未来去火星旅行将花费多少时间,time 是不可数名词,所以用“how much”。
3 Days to Mars: How Laser Propulsion Could Revolutionize Space TravelWhile crewed missions to Mars may not occur until after 2030,scientists are already working on a...Thompson, Ben
--- it is from our own planet Earth to Mars!---Yes, it takes months to travel to Mars by spacecraft.A. How soonB. How farC. How longD. How often
---___ it is from our own planet Earth to Mars!---Yes, it takes months to travel to Mars by spacecraft. A.How soon B.How far C.How long D.How often
--- it is from our own planet Earth to Mars!--- Yes, it takes months to travel to Mars by spacecraft.A.How soon B.How longC.How far D.How often
—Could you tell us ___ to travel from Earth to Mars by spaceship? —It takes months, I think. [ ] A. how far it takes B. how long it takes C. how long does it takD. how soon does it take
Mars takes between 150-300 days depending on the speed of the launch, the alignment of Earth and Mars, and the length of the journey the spacecraft takes to reach its target. It really just depends on how much fuel you’re willing to burn to get there. More fuel, shorter travel time...
Establishing a human presence on Mars will be risky, but researchers are finding solutions that will keep future residents alive long enough to die peacefully.
Advertisement - Continue Reading Below Moon and Mars The Moon Is Hiding Molten Goo in Its Deep Mantle A Wobble in Mars’ Orbit Could Detect Dark Matter The Earth Is Getting a New Mini-Moon A Hidden Ocean Is Lying Deep Within Mars Crust ...
How long does it take to get to Mars & what affects the travel time? The time it takes to get from one celestial body to another depends largely on the energy that one is willing to expend. Here "energy" refers to the effort put in by the launch vehicle and the sum of the maneuver...