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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
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
NGC 253, a starburst galaxy - NASA On the left, you see an image of the spiral galaxy NGC 253, taken with a ground-based telescope The galaxy is located about 8 million light-years away in the constellation Sculptor
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
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)
Optxagnf, optxagn: Colour temperature corrected disc and energetically . . . There are two versions of the model optxagnf is the one recommended for most purposes, and has the colour temperature correction calculated for each temperature from the approximations given in Done et al (2012) optxagn instead allows the user to define their own colour temperature correction, , which is then applied to annuli with effective temperature In both models the flux is set by
StarChild: Cosmology - NASA For more than ten years astronomers studied the expansion of the universe by measuring the redshift and brightness of distant supernovae By 1998, enough information had been gathered to lead scientists to the startling discovery that the expansion of the universe is not slowing but accelerating
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
StarChild: Cosmology - NASA For over ten years astronomers had been studying the expansion of the Universe by measuring the redshift and brightness of distant supernovae By 1998, a few dozen of these supernovae had been analyzed in detail, enough to lead scientists to the startling discovery that the expansion of the Universe is not slowing, as had been expected, but
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 universe, but which we cannot directly see! Dark matter was initially called "missing matter" because astronomers could not find it by observing the universe in any part of the electromagnetic