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In other words, CIGI is good for LEO missions like Gemini, Mercury, Shuttle but bad for BLEO missions like Apollo and Artemis.

Besides my political views with this program, I am glad to see that more countries are going forward to the Moon.

I have heard that the booster engine section of Vulcan will be reusable (not the booster tank, which will be expended). After jettisoning from the booster tank, the engine section will reenter the atmosphere with a heat shield at the front. Then it will deploy a big parafoil to float in lower...

I think there's at least one add-on that can change the keyboard shortcuts in Orbiter, but I can't call it up right now.

Is that mean Roscosmos will no longer participate the Artemis program? I came to know that Roscosmos would participate the Artemis program through a labelled rendering of the Gateway obtained from NASA, where it shows that the Multi-Purpose Module would be provided by Roscosmos.

AFAIK semi-major axis is defined for any conic sections, not just circles and ellipses, as @n72.75 has already pointed out.

He was probably confused with the Raptor engine (used on Starship) and the BE-4 engine (used on Vulcan, made by Blue Origin) as both engines run on liquid methane and LOX. However, a major difference between them is the BE-4 uses a simple staged combustion cycle, while the Raptor uses a complex...

According to an image from Wikimedia Commons, the final configuration of the Tiangong space station (yes, I'm no longer using "Tianhe" for the whole station) consists of only three modules: Tianhe, Wentian and Mengtian, far less than the number of modules at Mir (7) or the ISS (17, excluding the...

When I first came across the news that a person bought some land of the Moon, I took it to be completely rubbish as I thought the land ownership of anything beyond 100 km is banned under the Outer Space Treaty in 1967. However, I have come across such news (and memes related to it) several times...

See what is written on the screenshot posted above. It shows the gravity vector and its magnitude in yellow and the deceleration vector and its magnitude in red.

While watching the newly-uploaded Soyuz 18a video by Scott Manley, I found that he used an unknown add-on alongside a Soyuz add-on in his Orbiter 2016 simulation of Soyuz 18a. Where can I find this add-on? I am showing its screenshot below. Edit: I just got a better network connections and...

Xyon is indeed female. Her real-life given name is Lucy according to her profile page. Yes, I may have referred to her in masculine and I also feel sorry for this.

Me too, and it will be more exciting when the Americans will send a woman and a dark-skinned to the Moon within this wild decade, and possibly infinite when humans will walk on another planet. The 2020s decade is indeed the decade of transformation, the decade where numerous iconic rockets...

Is that mean that only the international segment of the ISS will be decommissioned in the 30s and the Russian segment will live long after this? Edit: No, it is a completely new station with a polar orbit.

At the time, people here in India thought that it was a house by lunar aliens.

Bigelow Expandable Activity Module (BEAM)?

Thank you for pointing this out. I thought that Proton is a cold-war icon that will be replaced by the purely civilian home-grown Angara rocket in this decade.

Download from mirror 4 instead. Orbiter-radio.co.uk mirrors are down. Edit: I just shared this link without noticing that Antelope_scn.zip is unavailable in the mirror. So you will never find the zip file until the server is fixed. Sorry for the inconvenience.

It should be noted that the mirror 4 of Orbiter 2016 does work, so the core Orbiter downloads aren't completely unavailable and newbies must use that mirror to download Orbiter 2016.

No, I actually wanted to change the JWST image taken from my wall collage to the 2009 NASA illustration of the telescope. Although I no longer want to change my avatar anymore, it seems like several other users might have the same problem.