Questions tagged [sls]

Space Launch System, the putative replacement for the Space Shuttle for future large missions.

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54
votes
4answers
48k views

Why not build Saturn V's again?

Why is the US developing a new rocket and spacecraft as opposed to building the Saturn V and Apollo stacks again? The SLS / Orion development programs certainly can't cost less than the unit cost of ...
4
votes
1answer
827 views

How does Exploration Mission 1 orbit differ from Apollo-era free-return? How far from Earth (and Moon) does it go?

I'm having trouble understanding the current orbit planned for NASA's Space Launch System's Exploration Mission 1. Is it possible to explain how the planned orbit works and what the maximum distance ...
14
votes
6answers
9k views

Why can the Falcon 9 be reused while the SLS cannot?

In reading about SLS, I learned that the reason they won't reuse their rocket is that the weight of the parachutes to enable recovery is too much of a sacrifice. How is the weight of the hardware and ...
23
votes
4answers
18k views

Is the SLS irrelevant if the Falcon Heavy launch is successful this year?

My take is that, like so many bad, and good, NASA ideas, the SLS will get the axe after spending billions on the NASA subcontractor(s). Regardless if the SLS comes to full life cycle, NASA will not ...
12
votes
2answers
971 views

What does the software quality process for NASA's SLS look like?

What does the software quality process for NASA's SLS look like? What are the relevant standards that they have to comply to? Do they have to show that they are CMMI compliant, for example? I'm ...
14
votes
3answers
5k views

What are the differences between SLS and Ares V?

SLS is to a large degree a continuation of the canceled Ares V, basically the STS without the orbiter. But what changes in design were made from Ares V to SLS? What were the reasons for those changes? ...
14
votes
1answer
2k views

Why won't the SLS boosters be recovered?

The SLS will be using five segment boosters derived from the four segment ones used during the STS program. Almost all of the STS boosters were recovered and reused, however NASA doesn't plan to ...
9
votes
4answers
4k views

Why were Solid Rockets chosen for the SLS

The SLS and the STS seem to be the only rockets utilizing SRBs... Why did they choose to go with them over LH/LOX or Kerosene/LOX? Wouldn't it also be easier to upgrade those rockets in the future?
6
votes
1answer
261 views

Could the SLS reach orbit without solid rocket boosters?

Could the SLS block 1 reach orbit without solid rocket boosters, and if so, how much payload could it lift? If it couldn't reach orbit in the block 1 config, could it do so with the Exploration ...
5
votes
1answer
256 views

NASA's RS-25 Engines

I am developing a FSX-based space flight simulator FSX SpacePort. I've been trying to get the detailed specs on NASA's RS-25 engine, namely, what were the ramp-up times for this engine? As in, how ...
5
votes
1answer
648 views

How will the SRBs used by the SLS differ from those used by the Shuttle?

The Space Launch System, which recently secured funding from Congress, uses many features that were developed from the Shuttle program, including the first-stage engines and boosters, and it's overall ...
4
votes
1answer
177 views

What naturally occurring navigational information is available for an autonomous return of SLS's EM-1?

This answer details some of the requirements that would need to be met if the Space Launch System's planned Exploration Mission 1 were to be human rated. I've further trimmed that truncated selection ...
3
votes
1answer
173 views

Human Rate the ICPS on EM-1 of SLS

What specifically must be done to Human Rate the Interim Cryogenic Propulsion Stage (ICPS) to fly humans on Exploration Mission 1 of SLS?
2
votes
1answer
135 views

Is SLS capable of launching the core stage into LEO?

After watching the Hazegrayart video If Rockets were Transparent I realized that I didn't really have a clear idea what the Space Launch System (SLS) is capable of doing. Question: Is SLS capable of ...
2
votes
0answers
138 views

What is the nature of the sextant tests on the ISS for Orion cis-lunar emergency navigation?

According to the NASA Johnson video Space to Ground: A Star to Steer By: 08/10/2018: A tool that once helped sailors cross vast oceans for centuries is now being put to the test in space. The crew ...