By the time visible light from extremely
distant galaxies reaches us, it appears as infrared light.
If the light from
a distant galaxy reaches us having passed through a cluster of say, four stars, she wondered, then how many images might we see?
Not exact matches
If the expansion continues to accelerate, then in 100 billion years, the gap between
galaxies will be growing so fast that light from
distant galaxies will no longer
reach us.
In the
distant future, astronomers may mistakenly conclude that the entire universe consists of just a handful of
galaxies in our local vicinity because all the
distant galaxies are receding from us so fast that light can not
reach us.
The light we see from our Sun takes just eight minutes to
reach us, while the light from
distant galaxies we see via today's advanced telescopes travels for billions of years before it
reaches us — so we're seeing what those
galaxies looked like billions of years ago.
In other words, there is a reasonable chance they came from more
distant reaches of the
galaxy — or beyond.
Peering into the far
reaches of the universe, astronomers have spotted seven
galaxies so
distant that they appear as they did less than 600 million years after the Big Bang.
In other words, there is a reasonable chance they came directly from more
distant reaches of the
galaxy — or beyond (arxiv.org/abs/1304.5356).
Starlight from very
distant galaxies takes billions of years to
reach Earth, so we see these
galaxies as they were billions of years ago.
Using the Hubble Space Telescope, the international team of collaborators peered across cosmic time to observe 65
distant galaxy clusters whose light has taken billions of years to
reach Earth.
The source was traced to a
distant galaxy, so far away that its light took around 3.9 billion years to
reach Earth.
The
galaxy is so
distant it has taken the light nearly six billion years to
reach us.
That number is far higher than scientists would expect to see shooting toward Earth from
distant reaches of the
galaxy.
Hubble was used to observe ultraviolet, visible and near - infrared wavelengths, but only with Spitzer have we been able to jump through the cosmic dust and clutter to see
distant reaches of the
galaxy with such amazing clarity.
The
galaxy, denoted Q1442 - MD50, is so
distant that it took 11 billion years for its light to
reach us.
When some of those curves are projected back in time, the speed of light becomes so fast that light from
distant galaxies conceivably could have
reached Earth in several thousand years.
It records the spectra of up to 50 objects simultaneously, especially useful for studies of
galaxies in the most
distant reaches, and earliest times, of the universe.
Also, the light from a
distant galaxy would have
reached Earth not too long after the light from nearby
galaxies.
LRIS also records the spectra of up to 50 objects simultaneously, especially useful for studies of clusters of
galaxies in the most
distant reaches, and earliest times, of the universe.
At this distance, the light from the
distant galaxies have traveled up to 13 billion years to
reach the space telescope.
Light from the most
distant galaxies we can see has taken billions of years to
reach us.
The beams that would have to be regularly targeted at the craft could, the theory goes, move far beyond and
reach Earth intermittently as FRBs, disrupted by the movement of
distant galaxies and planets.
Since we were measuring the dimming of blue light from these
distant galaxies caused by the foreground gas, the thin atmosphere at the summit of Mauna Kea allowed more of this blue light to
reach the telescope and be measured by the highly sensitive detectors of the LRIS spectrograph.
Its scientific impact will spread from studies of star formation within our own Milky Way, to probing
distant galaxies in the furthest
reaches of the Universe.
As Webb observes light that's traveled from the far
reaches of the cosmos, it captures images of
distant stars and forming
galaxies as they were in the earliest stages of the universe.
Light that is emitted or reflected by objects takes time to travel, and the vast distances it must cross to
reach us from the farthest parts of the universe means that we see the most
distant galaxies as they were billions of years ago.
To understand what that redshift measurement means, it's important to understand, by the time it
reaches us, the wavelength of light from very
distant galaxies is stretched by the expansion of the universe.