There were no heavy elements. Why was there probably no life in the galaxy 12 billion years ago?
Orbiting at a perfect balance
.
Why can’t we see a galaxy 15 billion light-years away?
C. Because looking 15 billion light-years away means looking to a time before the universe existed. Why can’t we see a galaxy 15 billion light-years away? … Galaxies may exist at that distance,
but their light would be too faint for our telescopes to see
.
Why are galaxies so far away?
The distance to a
galaxy is derived from its redshift
(how much the lines in its spectrum are shifted to the red because of the expansion of the universe). … If we see something that emitted its light 13 billion years ago, we are seeing it as it was when the universe was less than a billion years old.
Why do the oldest stars we observe contain almost nothing but hydrogen and helium?
Answer: A star made of only helium and hydrogen would
have to be among the first generation of stars ever born
, arising out of the primordial mix of elements that came from the Big Bang. … 2) Nebulae that scatter light are bluer than the stars that illuminate them. Earth’s sky is bluer than the Sun.
When was the first star born?
The very first stars likely formed when the Universe was
about 100 million years old
, prior to the formation of the first galaxies.
How long will the universe live?
22 billion years
in the future is the earliest possible end of the Universe in the Big Rip scenario, assuming a model of dark energy with w = −1.5. False vacuum decay may occur in 20 to 30 billion years if Higgs boson field is metastable.
What is the farthest we can see into space?
“From previous studies, the galaxy GN-z11 seems to be the farthest detectable galaxy from us, at
13.4 billion light-years
, or 134 nonillion kilometers (that’s 134 followed by 30 zeros),” Kashikawa said in a statement.
Do distant galaxies still exist?
14 in the journal Nature Astronomy,
astronomers have confirmed the most distant galaxy in our universe
. … Though the distant galaxy was originally spotted by the Hubble Space Telescope in 2016, Kashikawa and his team used the Keck I telescope in Hawaii to confirm its age and distance.
Can galaxies travel faster than light?
All the galaxies in the Universe beyond a certain distance appear to recede from us at speeds faster than light. … They
only appear to move faster than light
if we insist on a purely special relativistic explanation of redshift, a foolish path to take in an era where general relativity is well-confirmed.
Are there galaxies we Cannot see?
It’s true: there are some 2 trillion galaxies within the observable Universe, and 97% of them are already beyond our reach, even if we left today at the speed of light. But even though we cannot reach them,
we can still see them
.
Which is the oldest star in the universe?
Bond has led studies of the oldest-known Population II star – dubbed HD 140283, or
the “Methuselah Star
,” after an extremely long-lived patriarch in the Bible – which is about 200 light years from Earth and estimated to be more than 13.5 billion years old.
Are there any first generation stars left?
Astronomers using the NASA/ESA Hubble Space Telescope have
found no evidence of hypothetical first-generation stars
— called Population III stars — as far back as when the Universe was just 500 million years old. An artist’s impression of the early Universe.
What was the first star ever?
Age. Most stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.8 billion years old—the observed age of the universe. The oldest star yet discovered, HD 140283, nicknamed
Methuselah star
, is an estimated 14.46 ± 0.8 billion years old.
Why did it take 300 000 years to form the first atom?
Soon after the Big Bang the universe was very hot. As it cooled down the elementary particles started to form. It is thought that it took over 300,000 years for the first atoms to form
when protons and electrons had low enough energies to combine to form hydrogen
.
How was the first star created?
The universe primarily consisted of neutral hydrogen gas floating in an omnipresent sea of background radiation leftover from the Big Bang. Over time,
gravity slowly shepherded the densest regions of hydrogen gas into compact clouds
, which ultimately collapsed to form the first stars.
How many galaxies are there?
The deeper we look into the cosmos, the more galaxies we see. One 2016 study estimated that the observable universe contains two trillion—or
two million million
—galaxies. Some of those distant systems are similar to our own Milky Way galaxy, while others are quite different.
