ClaudSkills / Science & Research / physics

Cosmological Observation

Q: What is a Claude Code skill and how does the Cosmological Observation skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cosmological Observation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Science & Research · Sub-category: physics · Last updated: 2026-05-21

cloud:aws

Observational cosmology from Hubble's law to the CMB. Covers redshift, Hubble expansion, the cosmological parameters, the cosmic microwave background, large-scale structure, galaxy rotation curves and dark matter, Type Ia SNe and dark energy, and the current state of Lambda-CDM. Use when reasoning about the large-scale universe, interpreting cosmological surveys, or teaching the Big Bang evidence chain.

About this skill (catalog notes)

Cosmological Observation includes pricing or quota commentary. At roughly 2,180 words the SKILL.md is on the longer end of the catalog distribution.

Indexed lastmod: 2026-05-21
Catalog position: Science & Research · physics
Indexed related skills: 10

How Cosmological Observation fits the catalog

Cosmological Observation sits in the Science & Research category under the physics sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Modern cosmology is the shortest path from "what can I measure?" to "how old is the universe, what is it made of, and how does it end?" This skill covers the observational pillars: Hubble's law and redshift, the cosmic microwave background (CMB), Big Bang nucleosynthesis (BBN), large-scale structure, galaxy rotation curves as evidence for dark matter, Type Ia supernovae as evidence for dark energy, and the composition and parameters of the current concordance model (Lambda-CDM). It also covers the active frontier — the Hubble tension, the S8 tension, and the tests that could break or confirm…

What this skill does

Cosmological Observation is a community-contributed Claude Code skill in the physics sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/cosmological-observation/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when reasoning about the large-scale universe, interpreting cosmological surveys, or teaching the Big Bang evidence chain.

Who uses this skill

The Cosmological Observation Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/cosmological-observation
curl -L https://claudskills.com/skills/cosmological-observation/SKILL.md \
  -o ~/.claude/skills/cosmological-observation/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/cosmological-observation/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/cosmological-observation/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\cosmological-observation\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Cosmological Observation Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/cosmological-observation/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Cosmological Observation skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Cosmological Observation skill?

Use Cosmological Observation when your Claude Code task falls under the Science & Research category — specifically in the physics area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Cosmological Observation" or describe the task and let Claude pick). Browse related skills at /category/science/.

What is a Claude Code skill and how does the Cosmological Observation skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cosmological Observation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

ClaudSkills. (2026). Cosmological Observation [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/cosmological-observation/

BibTeX

@misc{cosmological-observation-2026,
  author    = {ClaudSkills},
  title     = {Cosmological Observation [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/cosmological-observation/}
}

Embed this skill

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Badge

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Browse all Science & Research skills → Top 100 skills

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