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Summary: Japan space agency to review its Epsilon S rocket development plan NHK

- Japan's space agency (JAXA) is reviewing the Epsilon S rocket development plan due to ongoing technical difficulties.
- Repeated explosions during second-stage combustion tests in 2023 and 2024 have prompted a temporary shift back to the older Epsilon rocket design.
- The revised plan will delay performance improvements and reduce launch capability compared to the initial Epsilon S goals, following a recent H3 rocket launch failure.

A: Hey! Did you hear about JAXA’s rocket plans?

B: No! What’s up? Is everything okay?

A: Well, it's a little complicated. They're rethinking their Epsilon S rocket.

B: Really? What happened?

A: Apparently, there have been some explosions during testing. Like, two separate explosions! One in Akita and one in Kagoshima.

B: Oh no! That’s scary!

A: Yeah! So, they're pausing work on making it even better for now.

B: So, they’re going back to an older model?

A: Exactly! They'll use the old Epsilon rocket instead. They’re going to test it soon, in April.

B: That sounds like a setback. Will it still be able to launch satellites?

A: It will, but it won’t be as powerful as they originally hoped.

B: That’s too bad. I remember when the H3 rocket failed last year, too.

A: I know! Now Japan doesn’t have a working rocket at all. It’s a tricky situation.



B: Wow, that’s a lot of trouble! Hopefully, they'll figure it out quickly!
Summary
JAXA is reviewing the Epsilon S rocket plan after combustion test explosions. Development is paused, reverting to the older Epsilon design & delaying performance upgrades. Follows a previous H3 rocket failure, impacting launch capability. #JAXA #rockets
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2026/02/05 08:25 Anonymous 233 91s 153
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ID: 702b095f-7cbc-4402-9e2b-4002ed86e553

Category ID: listed_summary

URL: https://www3.nhk.or.jp/nhkworld/en/news/20260204_21/#summary

Date: Feb. 4, 2026

Notes: NHK News Summary - 2026-02-04

Created: 2026/02/04 22:40

Updated: 2026/02/05 08:25

Last Read: 2026/02/05 08:25

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