hubble effect
31space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …
32Big Bang — This article is about the cosmological model. For the sitcom, see The Big Bang Theory. For other uses, see Big Bang (disambiguation) …
33Dark matter — Not to be confused with antimatter, dark energy, dark fluid or dark flow. For other uses, see Dark Matter (disambiguation) …
34Climate of Mars — Mosaic image of Mars as seen by Viking 1, 22 February 1980 The climate of Mars has been an issue of scientific curiosity for centuries, not least because Mars is the only terrestrial planet whose surface can be directly observed in detail from… …
35Calendar of 1993 — ▪ 1994 January January 1 Czechoslovakia now two nations. What had been the single nation of Czechoslovakia officially became two independent states, the Czech Republic and Slovakia. Vaclav Havel, the former president of Czechoslovakia, and… …
36Physical cosmology — This article is about the physics subject. For other uses, see Cosmology. Physical cosmology …
37Non-standard cosmology — Physical cosmology Universe · Big Bang …
38Pioneer anomaly — The Pioneer anomaly or Pioneer effect is the observed deviation from expectations of the trajectories of various unmanned spacecraft visiting the outer solar system, notably Pioneer 10 and Pioneer 11. Both spacecraft are escaping from the solar… …
39Tests of general relativity — General relativity Introduction Mathematical formulation Resources Fundamental concepts …
40Moon landing conspiracy theories — Astronauts Buzz Aldrin and Neil Armstrong in NASA s training mockup …
