How might observations of very distant galaxies help astronomers learn about the early universe?
How might observations of very distant galaxies help astronomers learn about the early universe?
In addition to looking at the most distant galaxies we can find, astronomers look at the oldest stars (what we might call the fossil record) of our own Galaxy to probe what happened in the early universe. Several other observations also establish that star formation in the cosmos began very early.
What do observations of very distant galaxies provide to the study of cosmic history?
Sifting through cosmic history Data from the Very Large Telescope helped the astronomers measure the distances of these galaxies accurately, which enabled them to determine that they were seeing the galaxies as they were between 780 million and a billion years after the Big Bang.
How do we know that there are intergalactic clouds between a distant quasar and us?
How do we know that there are intergalactic clouds between a distant quasar and us? We see hydrogen absorption lines at redshifts smaller than that of the quasar. Which of the following cannot be true of the very first stars formed in the Universe? They may have had rocky planets around them.
Why are the three very distant galaxies pointed out in this image see white arrows red in color?
Why are the three very distant galaxies pointed out in this image (see white arrows) red in color? The extreme recessional speed causes a large Doppler shift. It is a bright band of light that goes around the entire sky and it is the disk of the galaxy of which we are a part.
What is the difference between an SBb galaxy and an SB Galaxy Group of answer choices?
The SBb galaxy has a bar of material passing though the center and the Sb galaxy does not. What is the difference between an Sb galaxy and an Sc galaxy? The Sb galaxy has more tightly wound spiral arms than the Sc galaxy.
How can we observe other galaxies?
Some observers with large scopes use an 82A filter to observe galaxies because of what it does to suppress the natural glow of the upper atmosphere. Other observers have used both light and dark blue filters on bright spiral galaxies to boost the contrast of their arms.
Why can’t we see past the cosmological horizon quizlet?
Why can’t we see past the edge of the observable universe (called the cosmological horizon)? Beyond the cosmological horizon, we are looking back to a time before the universe had formed. B. The cosmological horizon is infinitely far away, and we can’t see to infinity.
Can we see past the cosmic horizon?
We can’t be completely sure since we can’t get information from beyond the horizon. But since space gets stretched with the expansion, light waves get lift and we can see further than that: the cosmic horizon is roughly at 42 billion light-years away.
How many years are left in the universe?
Vacuum decay might already have begun in some distant place. We won’t see it coming. Not to worry, though. As Mack counsels, whatever it looks like, the end probably won’t be nigh for at least 200 billion years.
Can Time Machine be invented?
Recent investigations into this question have provided some evidence that the answer is no, but it has not yet been proven to be impossible.” Even the slight possibility of time travel exerts such fascination that many physicists continue to study not only whether it may be possible but also how one might do it.
Is traveling light speed possible?
So will it ever be possible for us to travel at light speed? Based on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. So, light-speed travel and faster-than-light travel are physical impossibilities, especially for anything with mass, such as spacecraft and humans.
How fast do you have to be to go back in time?
General relativity also provides scenarios that could allow travelers to go back in time, according to NASA. The equations, however, might be difficult to physically achieve. One possibility could be to go faster than light, which travels at 186,282 miles per second (299,792 kilometers per second) in a vacuum.