Redshift and Hubble's Law - NASA
Redshift and Hubble's Law For very far objects (beyond about 1 billion light-years) none of the above methods work. Scientists must move from direct observation to using observations in conjunction …
How old is the universe? - NASA
Jul 21, 2023 · StarChild Question of the Month for December 2000 Question: How old is the universe? Answer: UPDATE (July 21, 2023)! Measurements made by NASA's WMAP spacecraft have shown …
How do we measure the distances to things in space? - NASA
Radar - measuring distances in our solar system Parallax - measuring distances to nearby stars Cepheids - measuring distances in our Galaxy and to nearby galaxies Supernovae - measuring …
Parallax - NASA
Astronomers derive distances to the nearest stars (closer than about 100 light-years) by a method called stellar parallax. This method that relies on no assumptions other than the geometry of the Earth's …
How do we know that dark matter exists? - NASA
StarChild Question of the Month for July 2003 Question: How do we know that dark matter exists? Answer: Dark matter is the name scientists have given to the particles which we believe exist in the …
StarChild: Dark Matter - NASA
There is no current problem of greater importance to cosmology than that of dark matter. Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by …
StarChild: Cosmology - NASA
About 100 years ago, astronomer Edwin Hubble made observations that showed the universe was getting bigger and bigger! This led most cosmologists to believe in a theory called the Big Bang. The …
StarChild: Cosmic Background Explorer - NASA
The Cosmic Background Explorer (COBE) was launched on November 18, 1989. Its mission was to study the microwave sky in order to detect radiation emitted by the Big Bang. Scientists have been …
StarChild: The Hubble Space Telescope - NASA
The Hubble was designed to work in orbit for fifteen years. The Space Shuttle and its astronauts are to perform servicing missions throughout Hubble 's lifetime. In addition to keeping Hubble running …
StarChild: The Hubble Space Telescope - NASA
The Hubble Space The Hubble Space Telescope was named after the astronomer Edwin Hubble, who, as a boy, had a paper route.