This Hubble image of NGC 2525 galaxy shows a bright supernova at the lower left of the galaxy. Nearly a year, disappeared without a trace.

Decades of observation

The telescope was named after the pioneer astronomer Edwin Hubble, who discovered in 1920 that the distant clouds in the universe were actually galaxies. He died in 1953. )

Hubble relies on the brightness period of pulsating stars called Cepheid Variables discovered by astronomer Henrietta Swan Levitt in 19 12. Cepheid, like a cosmic milestone, periodically brightens and darkens in our Milky Way and other galaxies.

Hubble's work revealed that our galaxy is one of many galaxies, which changed our view and position in the universe forever. Astronomers continue their work and find that distant galaxies seem to be moving rapidly, which shows that we live in an expanding universe from the Big Bang.

The exploration of the expansion rate of the universe helped to win the Nobel Prize in Physics in 20 1 1, which was awarded to saul perlmutter, Brian P Schmidt and Reese for "discovering the accelerated expansion of the universe by observing distant supernovae".

Reese continues to lead the shoe (short for supernova H0), the equation of state of dark energy, which is a scientific cooperation project to study the expansion rate of the universe. His team is publishing a paper in the Journal of Astrophysics, which provides the latest update of Hubble constant because the expansion rate is known.

Hubble took this rare picture of the blue variable star Carina AG, which is located in the Milky Way, 20,000 light years away from the Earth. This star has experienced several explosions, producing a unique halo.

However, according to the standard cosmological model of the universe used by astronomers (a theory that implies the components of the Big Bang) and the measurement results of Planck of the European Space Agency, the actual predicted expansion speed of the universe is slower than that observed by Hubble telescope.

Planck, another space observatory, is used to measure the microwave background of the universe, or the residual radiation of BIGBANG 65.438+038 billion years ago.

The Hubble constant obtained by Planck mission scientists is 67.5 plus or minus 0.5 km/s/mpas.

Launched in June+February, 5438, James Webb Space Telescope will be able to observe Hubble's mile mark with clearer resolution and farther distance.