What’s on the Spacetime poster
The rule, 3 worked examples, and the mistake everyone makes.
- The spacetime interval between two events is the same for every observer.
- s² = (cΔt)² − Δx²
- s² > 0 = Timelike — causal connection possible
- s² = 0 = Lightlike — connected by light only
- s² < 0 = Spacelike — no causal connection
- Common mistake: Treating time as a fourth spatial dimension → It enters with the oppo…
Different observers disagree about Δt and Δx, but every one of them computes the same interval s.
Questions about the Spacetime poster
- What’s on the Spacetime poster?
- The rule, 3 worked examples, and the mistake everyone makes. The spacetime interval between two events is the same for every observer.; s² = (cΔt)² − Δx²; s² > 0 = Timelike — causal connection possible; s² = 0 = Lightlike — connected by light only; s² < 0 = Spacelike — no causal connection; Common mistake: Treating time as a fourth spatial dimension → It enters with the oppo…. Different observers disagree about Δt and Δx, but every one of them computes the same interval s.
- Who is the Spacetime poster for?
- Spacetime belongs to the Physics section rather than to a school year, because physical science is not something one grade owns. Anyone learning relativity can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Spacetime poster?
- Space and time are components of one thing. The interval between events is invariant. A wall chart earns its place by being glanceable from where the work is happening, so Spacetime belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.
- What other posters go with Spacetime?
- Relativity of Simultaneity, Black Holes and Cosmology sit alongside Spacetime in the Physics section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Relativity of SimultaneityBlack HolesCosmology
- Is the Spacetime poster free to download and print?
- Yes. Spacetime downloads as a free PDF with no account, no email and no watermark, like everything else in the Physics section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Spacetime poster print at?
- Spacetime is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Spacetime loses nothing.Printing guide
Related posters
Charts that sit alongside Spacetime on the same wall.
Browse every Physics poster, or start from the full catalogue.