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davieG

Technology, Science and the Environment.

By davieG, in General Chat

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String fellow

String fellow

Posted
Posted

If a rifle were strapped to the outside of the space capsule travelling at 25,000mph towards (and half-way) to the Moon, and was fired (with a muzzle velocity of 2,500mph) straight backwards in the direction of Earth, where would the bullet finally end up?

  • Haha 1
leicsmac

leicsmac

Posted
Posted (edited)
15 minutes ago, String fellow said:

If a rifle were strapped to the outside of the space capsule travelling at 25,000mph towards (and half-way) to the Moon, and was fired (with a muzzle velocity of 2,500mph) straight backwards in the direction of Earth, where would the bullet finally end up?

Likely impacting with the Moon, because the current course of the Artemis II is a free return trajectory and reducing the relative velocity of an object on that trajectory tends to most often put them in the gravitational pull of whatever object they are visiting next.

Edited by leicsmac
  • Like 1
SpacedX

SpacedX

Posted
Posted
3 hours ago, String fellow said:

If a rifle were strapped to the outside of the space capsule travelling at 25,000mph towards (and half-way) to the Moon, and was fired (with a muzzle velocity of 2,500mph) straight backwards in the direction of Earth, where would the bullet finally end up?

I understand that this is hypothetically speaking, but if it was half way to the moon it wouldn't be travelling a 25,000mph based upon current TLI and even escape velocity burns, more in the region of 2,500mph. 

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Trav Le Bleu

Trav Le Bleu

Posted
Posted
On 03/04/2026 at 13:29, String fellow said:

If a rifle were strapped to the outside of the space capsule travelling at 25,000mph towards (and half-way) to the Moon, and was fired (with a muzzle velocity of 2,500mph) straight backwards in the direction of Earth, where would the bullet finally end up?

Seems like you would love this YouTube channel...

 

https://youtube.com/@xkcd_whatif?si=ULgDbQFvDi6IsGm5

 

 

You're welcome.

 

  • Like 1
Wymsey

Wymsey

Posted
Posted

'Artemis II crew breaks record for the furthest humans have ever travelled from Earth.'

 

 

HaVe they SeEn aNY AlIENS ThoUGH??

Trav Le Bleu

Trav Le Bleu

Posted
Posted
3 hours ago, Wymsey said:

'Artemis II crew breaks record for the furthest humans have ever travelled from Earth.'

 

 

HaVe they SeEn aNY AlIENS ThoUGH??

Only illegal aliens.

 

Eh, Vasquez?

  • Haha 2
Guest worth_the_wait

Guest worth_the_wait

Posted
Posted
On 06/04/2026 at 19:05, Wymsey said:

'Artemis II crew breaks record for the furthest humans have ever travelled from Earth.'

HaVe they SeEn aNY AlIENS ThoUGH??

An extra 4,000 miles further out, than the 250,000 miles done, in the days of black and white TVs.     Whoop-de-doo.

 

Next thing, the BBC will be telling us (lots of times), that it's the most powerful rocket ever to have taken humans to the moon.   EVER.

leicsmac

leicsmac

Posted
Posted
2 minutes ago, worth_the_wait said:

An extra 4,000 miles further out, than the 250,000 miles done, in the days of black and white TVs.     Whoop-de-doo.

 

Next thing, the BBC will be telling us (lots of times), that it's the most powerful rocket ever to have taken humans to the moon.   EVER.

Yep, we should never have turned away in the first place. Imagine where we'd be now if we hadn't. 

 

Instead, we're playing catchup and have barely got to where we were a half century ago. 

Guest worth_the_wait

Guest worth_the_wait

Posted
Posted

Not sure if this has been mentioned before ...

 

Looking up at the sky on a clear dark night, the number of artificial satellites you can see is mental.   There are absolutely loads of them visible.   There are often a couple every minute, and sometimes you can see 3 on the move at the same time.

 

20 to 30 years ago, you'd been lucky to see one (space station) in a couple of hours.   The other night - I saw 10 of them in as many minutes.

 

Super_horns

Super_horns

Posted
Posted
2 hours ago, leicsmac said:

Artemis II re-entry in a couple of hours. Here's hoping it all goes smoothly.

Looks like it has fortunately.

 

Fantastic mission and well done to all involved.

 

  • Like 1
leicsmac

leicsmac

Posted
Posted
7 hours ago, Super_horns said:

Looks like it has fortunately.

 

Fantastic mission and well done to all involved.

 

 

1 hour ago, The Bear said:

What a superb mission. I think it's safe to say the Orion performed superbly. Here's looking forward to Artemis 3 and 4.

Yeah, went about as well as it possibly could have. 

 

I wonder whether the Chinese will now look to speed things up in terms of their own mission, or whether they won't mind being a close second to NASA this time round.

  • Like 1
The Bear

The Bear

Posted
Posted

The Artemis program timeline is highly ambitious and is very likely to be pushed back. The proposed landers haven't even been built or tested yet and won't until next year. 

 

I doubt the Chinese will be too worried as their moon mission is supposed to be technically simpler to achieve. 

  • Like 1
leicsmac

leicsmac

Posted
Posted
3 minutes ago, The Bear said:

The Artemis program timeline is highly ambitious and is very likely to be pushed back. The proposed landers haven't even been built or tested yet and won't until next year. 

 

I doubt the Chinese will be too worried as their moon mission is supposed to be technically simpler to achieve. 

Fair points. 

 

It may well be close, then.

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