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- Redshift and Hubbles 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 with a theory The theory used to determine these very great distances in the universe is based on the discovery by Edwin Hubble that the universe is expanding
- StarChild: A Learning Center for Young Astronomers
Well that's a redshift, redshift If the star is moving away By reading Doppler Shifts of all we see in the skies (clusters of galaxies, near and far) We get the big picture and a big surprise (redshifts going, redshifts going) The Universe is growing and expanding away (galaxies are speeding, speeding away) But maybe gravity will shrink it back
- How do we measure the distances to things in space? - NASA
It is not an easy thing to measure the distances to objects in the universe since these objects are usually very far away We can't just run out there with a ruler! To measure distances in the universe, we will need to construct what is commonly referred to as a "cosmic distance ladder" In other words, astronomers use different methods to determine the distances to objects; the specific
- StarChild: A Learning Center for Young Astronomers
Well that's a redshift, redshift If the star is moving away By reading Doppler Shifts of all we see in the skies (clusters of galaxies, near and far) We get the big picture and a big surprise (redshifts going, redshifts going) The Universe is growing and expanding away (galaxies are speeding, speeding away)
- StarChild: A Learning Center for Young Astronomers - NASA
StarChild is a learning center for young astronomers ages 5-13 to learn about the solar system, the Milky Way galaxy, and the universe beyond Use the links above to explore the site's topics If you are looking for something a bit more advanced (ages 14+), then head on over to Imagine the Universe!
- StarChild: The Universe - NASA
The universe is a vast expanse of space which contains all of the matter and energy in existence The universe contains all of the galaxies, stars, and planets The exact size of the universe is unknown Scientists believe the universe is still expanding outward They believe this outward expansion is the result of a violent, powerful explosion that occurred about 13 7 billion years ago This
- What is meant by false color? - NASA
StarChild Question of the Month for April 2000 Question: What is meant by "false color"? Answer: The term "false color" is used to describe what astronomers (and others) often do to images to make them more comprehensible Long ago, when radio astronomers first started generating images of sources, they wound up with essentially images that were just shades of gray - ranging from pure black to
- 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 orbit around the Sun You are probably familiar with the phenomenon known as parallax Try this Hold out your thumb at arm's length, close one of your eyes, and examine the relative position
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