Lucas Kramer

Catholic | Designing faster AI chips at @MatXComputing | PhD student at @UMNComputerSci with @MELTgroup | Somewhat obsessed with space

[Lucas Kramer @lrkramer5]

@TheRealTomahawk @Erdayastronaut Starship doesn't have enough dV to get back to earth, let alone enter LEO.

[Lucas Kramer @lrkramer5]

@jeff_foust Interesting to hear public confirmation of this. I guess that means they don't even need Centaur on SLS until at least Artemis VI (or whenever Blue does their second landing mission.)
I honestly could see them just dropping Centaur on SLS entirely in that case.

[Lucas Kramer @lrkramer5]

@jeffreyhuber @CJHandmer I was fortunate enough to stay there once 15 years ago; my parent's car had brake problems and they had a room set aside specifically for people with car trouble.

[kai @ssvankai]

accidentally stumbled upon this crazy paper abstract

[Lucas Kramer @lrkramer5]

@NASASpaceflight @dwisecinema Is that a flight booster or the pathfinder parked outside the hangar?

[Lucas Kramer @lrkramer5]

@Truthful_ast Might beat N-1. Methalox has more complete and faster combustion than RP-1/LOX, so while there was ~half as much fuel as N-1, the explosive yield was potentially in the same ballpark.

[Lucas Kramer @lrkramer5]

@BackwardsFeet @MosesD40 I had forgot that it was still a thing in the TLM. I served at a solemn high mass for the first time a few weeks ago, and it kind of caught me off guard when the server next to me offered me peace.

[Chris Williams @Astro_ChrisW]

On April 27th at about 10:40 PM GMT, I was in the @Space_Station Cupola and saw something really neat. I was scanning the sky to try to catch a glimpse of the approaching Progress MS-34 vehicle bringing new supplies. Just as we were passing over West Africa, I saw a bright object directly below us, streaking through the upper atmosphere. I saw its tail grow and then split apart into a shower of smaller pieces. I think it must have been some piece of orbital debris or a satellite breaking up as it entered the atmosphere. It was quite a light show!

[Lucas Kramer @lrkramer5]

@dpoddolphinpro @NASA @NRO_gov Supposedly the mirrors are left over from a cancelled next-generation spy sat program that never flew.

[Lucas Kramer @lrkramer5]

@cremers_ Cool!

[Reid Wiseman @astro_reid]

Only one chance in this lifetime…

Like watching sunset at the beach from the most foreign seat in the cosmos, I couldn’t resist a cell phone video of Earthset. You can hear the shutter on the Nikon as @Astro_Christina is hammering away on 3-shot brackets and capturing those exceptional Earthset photos through the 400mm lens. @AstroVicGlover was in window 3 watching with @Astro_Jeremy next to him.

I could barely see the Moon through the docking hatch window but the iPhone was the perfect size to catch the view…this is uncropped, uncut with 8x zoom which is quite comparable to the view of the human eye. Enjoy.

[Reiner Pope @reinerpope]

I chatted with @ysmulki about MatX, chip design and where silicon designed for LLMs is headed

(8:17) Tightly coupling SRAM and HBM on one chip
(14:03) More MoE FLOPS, smaller KV cache load
(16:08) Numerics: from 32-bit to 4-bit
(19:02) Targeting both training and inference
(22:14) Chip timelines
(27:15) Logic and memory scarcity
(29:42) Compute costs
(32:07) Latency: from 20ms to 1ms as the new table stakes
(40:50) Programming the chip
(43:00) Starting MatX
(47:11) Codesign without seeing the models
(51:57) Interconnect design
(55:44) Performance modeling philosophy
(1:07:02) Prefill vs. decode
(1:13:47) What's next

[Lucas Kramer @lrkramer5]

I was at a Byzantine Divine Liturgy on Saturday. The priest said he was also helping out with holy week at a Russian Catholic Church who uses the Julian calendar; he said celebrating Good Friday again in the octave of Easter was rather strange, but it was still also good to meditate on how Christ's passion was needed for the resurrection.

[Morris Day and the (Ordinary) Time❤️‍🔥 @Uncouth_Bard]

Wonder if anyone has written a Low G/Null G usage of the Roman Rite for use in Orbit/Deep Space or on Luna?

[Lucas Kramer @lrkramer5]

@peterrhague To be fair it still needs to get integrated with the to-be-completed engine section at KSC.

[NASA Artemis @NASAArtemis]

The eclipse from Orion.

On April 6, external cameras attached to the Orion spacecraft's solar array wings captured the Moon backlit by the Sun during a solar eclipse.

[Fr. Paul @BackwardsFeet]

Cæli enarrant gloriam Dei, et opera manuum eius annuntiat firmamentum

[Max Evans @_MaxQ_]

EARTHSHINE!

[The White House @WhiteHouse]

THE ARTEMIS II ECLIPSE.
April 6, 2026.

Totality, beyond Earth. From lunar orbit, the Moon eclipses the Sun, revealing a view few in human history have ever witnessed. Photo: NASA

[NASA Artemis @NASAArtemis]

Earthset.

The Artemis II crew captured this view of an Earthset on April 6, 2026, as they flew around the Moon. The image is reminiscent of the iconic Earthrise image taken by astronaut Bill Anders 58 years earlier as the Apollo 8 crew flew around the Moon.