Cosmic yardsticks
Supernovae, such as these seen by the Hubble Space Telescope, are as
bright as galaxies and are widely used to measure how fast the universe is expanding.
Source: NASA
![[IOP]](http://images.iop.org/cws/icons/themes/phw/colophon-small.png){kind=icon}
A website from the Institute of Physics
A website from the Institute of Physics
Supernovae, such as these seen by the Hubble Space Telescope, are as
bright as galaxies and are widely used to measure how fast the universe is expanding.
Source: NASA
