Cosmic Alerts vs Relativity Simulator

Where in the sky, and how far from Earth, did it happen? This app plots gravitational waves, gamma-ray bursts, high-energy neutrinos and fast radio bursts using the observational data that research institutions publish. ■ A 3D map that uses real distances Earth sits at the origin. Events with a measured redshift are placed at their actual comoving distance. Turn the dial and the viewpoint travels from just outside Earth all the way to the edge of the observable universe — from looking up at the sky like a planetarium to seeing the whole universe at once, without a break. ■ All-sky map The whole sky on one page, in galactic coordinates with the Hammer-Aitoff equal-area projection. It is the same layout as the famous all-sky figure CGRO/BATSE produced from 2,704 gamma-ray bursts, so you can read off the fact those bursts scatter isotropically instead of crowding the galactic plane. ■ Colour is photon energy Twelve decades of energy, from µeV radio waves to PeV neutrinos, mapped to colour. Marker size is fluence — the total energy that reached us. Drag across the legend to show only the band you care about. ■ When something is unknown, it says so Most gamma-ray bursts have no measured distance. Empirical spectral relations can give an estimate, but the same observables map to several redshifts, so the value is not determined. This app never presents an estimate as a distance. Bursts with only a known direction are drawn as rays from the origin — so the fact that most bursts have no known distance is itself visible on screen. ■ Alerts for new events When a new event is published, the app creates a notification on your device. You can choose which event types to be told about. No push notification server is involved. ■ Data sources • GWOSC (Gravitational Wave Open Science Center, LIGO/Virgo/KAGRA) • GraceDB (LIGO/Virgo/KAGRA low-latency alerts) • NASA HEASARC (Fermi GBM / Swift BAT / CGRO BATSE burst catalogs) • NASA GCN (AMON/IceCube high-energy neutrinos) • CHIME/FRB Catalog 1 (CHIME/FRB Collaboration et al. 2021, ApJS 257, 59, CC BY 4.0) • Star background: Yale Bright Star Catalog All of it comes from archives those institutions publish openly. This app is unofficial and is not endorsed by or affiliated with any of them. ■ Also • English / 日本語 / Français / Deutsch / Español / 简体中文 / 繁體中文 • No account required • Retrieved data is stored on your device, so the last state is readable offline • Distances and lookback times use the Planck 2018 ΛCDM model

Relativity Simulator is an interactive relativity toolkit built strictly on the axiomatic foundations of modern physics. There is no "hard sci-fi" here — every result traces back to the Lorentz transformation of special relativity or the Einstein field equations of general relativity, and is verified against numerical truth fixtures. 【Real physics, not imagination】 · 20 interactive modules covering core effects from special relativity to black holes, gravitational waves, and curved spacetime; · Each module ships with precise charts, adjustable parameters, and a "Theory Card" with a fully visible derivation chain; · All demo numbers are recomputed locally on your device from real CODATA constants — nothing is fabricated. 【Phenomena you can verify yourself】 · Gravitational time dilation: why clocks run faster up high — ~80 ns/day faster atop Everest, ~38 µs/day faster on GPS satellites; · Twin paradox: fly to 4.22 light-years at 0.8c and the Earth twin ages 10.5 years while the traveler ages only 6.3; · Tidal disruption: why you get stretched into "spaghetti" falling into a black hole — small holes tear you outside the horizon, supermassive ones only after you cross it; · Plus light bending, gravitational lensing, the Schwarzschild horizon, frame dragging, and mass–energy equivalence E=mc². 【Built for learning and teaching】 · Volume-based progression: kinematics → gravitational field → black holes → cosmology → applications; · Bilingual (zh/en) system notes ship with every effect: derivation, physical quantities, and references; · Chinese / English UI follows your system language. 【Privacy first】 The app collects, stores, and transmits no personal data, embeds no third-party SDKs, and runs every computation locally on your device. Whether you are studying, teaching, or simply curious, Relativity Simulator lets you actually run the "invisible spacetime" and watch it.