Does time ever end?
Does time ever end?
According to Einstein’s General Relativity, which is our best current description of space and time, the only place where time – and also space – ends is in a so-called singularity. This involves gravitational forces becoming so intense that space and time lose all meaning.
What happens if an astronaut gets pregnant in space?
The primary problems with becoming and remaining pregnant in space are radiation and low-gravity environments. It’s important to understand both. Radiation can affect a man’s sperm count, rendering him infertile, possibly permanently. It can also harm a developing fetus.
Can space be created?
3 Answers. Yes, space is constantly being created. The new space does not hold any matter (like atoms) or dark matter. This means that the density of normal and dark matter decreases at the same rate as the volume increases.
How far away can we see in space?
30 billion light-years away
What is left after a star dies?
Stars die because they exhaust their nuclear fuel. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’. What’s left over after a supernova explosion is a ‘neutron star’ – the collapsed core of the star – or, if there’s sufficient mass, a black hole.
Why do supernovas explode?
It’s a balance of gravity pushing in on the star and heat and pressure pushing outward from the star’s core. When a massive star runs out of fuel, it cools off. This causes the pressure to drop. The collapse happens so quickly that it creates enormous shock waves that cause the outer part of the star to explode!
What is the closest star from Earth?
Proxima Centauri
What happens to your body if you die in space?
If you do die in space, your body will not decompose in the normal way, since there is no oxygen. If you were near a source of heat, your body would mummify; if you were not, it would freeze. If your body was sealed in a space suit, it would decompose, but only for as long as the oxygen lasted.
How close is the nearest star in light-years?
about 4.37 light-years
Who is the astrophysicist who first advanced the idea that the chemical elements originated from hydrogen in stars?
Hubert Reeves
Does the universe have an end?
It never ends, but it’s also constantly expanding. Scientists don’t think there is a true edge of the universe.
How many stars die each day?
We estimate at about 100 billion the number of galaxies in the observable Universe, therefore there are about 100 billion stars being born and dying each year, which corresponds to about 275 million per day, in the whole observable Universe.
What is the material sent into space by a supernova?
This shock wave compresses the material it passes through and is the only place where many elements such as zinc, silver, tin, gold, mercury, lead and uranium are produced. Over several months the gases cool and fade in brightness and join the debris of interstellar space.
What is the stellar process in which the fusion of hydrogen produces other elements?
Stellar nucleosynthesis
What is the smallest star?
EBLM J0555-57
Can Hubble see the moon?
The moon is a difficult target for Hubble because it moves across the sky faster than Hubble can track it and is very dim in ultraviolet light. The observations required steady, precise, as well as long exposures to search for the resources.
Where does space end?
No, they don’t believe there’s an end to space. However, we can only see a certain volume of all that’s out there. Since the universe is 13.8 billion years old, light from a galaxy more than 13.8 billion light-years away hasn’t had time to reach us yet, so we have no way of knowing such a galaxy exists.
Do female astronauts wear bras?
According to this Salon article[1], yes they do. They don’t need the support, but the bra keeps their wobbly bits in place while floating around in microgravity. They also like having an extra layer between said bits and the cameras all over the space station.
How far is the farthest star in our galaxy?
13.4 billion light-years
Which elements are created in stellar nucleosynthesis quizlet?
nucleosynthesis? were created from hydrogen and helium by stellar nucleosynthesis some of these elements are particularly those that are lighter than iron.
Will the universe last forever?
Theories about the end of the universe. The fate of the universe is determined by its density. The preponderance of evidence to date, based on measurements of the rate of expansion and the mass density, favors a universe that will continue to expand indefinitely, resulting in the “Big Freeze” scenario below.
What are the natural cause of extinction?
Extinction occurs when species are diminished because of environmental forces (habitat fragmentation, global change, natural disaster, overexploitation of species for human use) or because of evolutionary changes in their members (genetic inbreeding, poor reproduction, decline in population numbers).
How did Einstein prove relativity?
Einstein postulated three ways this theory could be proved. One was by observing the stars during a total solar eclipse. The sun is our closest strong gravitational field. Light traveling from a star through space and passing the sun’s field would be bent, if Einstein’s theory were true.
Which is most likely to cause a mass extinction?
The most commonly suggested causes of mass extinctions are listed below.
- Flood basalt events.
- Sea-level falls.
- Impact events.
- Global cooling.
- Global warming.
- Clathrate gun hypothesis.
- Anoxic events.
- Hydrogen sulfide emissions from the seas.
Can time be bent?
Einstein’s theory of special relativity says that time slows down or speeds up depending on how fast you move relative to something else. Also, under Einstein’s theory of general relativity, gravity can bend time. Picture a four-dimensional fabric called space-time.
What are possible causes of mass extinction quizlet?
Some possible causes of mass extinction include a huge asteroid striking Earth, many large volcanoes erupting, continents changing position, and sea levels changing.
What is the most recent animal to go extinct?
- Species that went extinct in 2020.
- Splendid poison frog.
- Jalpa false brook salamander.
- Simeulue Hill myna.
- Lost shark.
- Smooth handfish.
- Lake Lanao freshwater fish.
- Chiriqui harlequin frog.
Are humans the main cause of animal extinction?
Human activity puts 1 million species of plants and animals at risk of extinction, a startling report from the United Nations showed recently. It’s a sobering warning — but if we rethink conservation, such destruction doesn’t have to be our future.
What are the 5 mass extinctions on Earth?
Top Five Extinctions
- Ordovician-silurian Extinction: 440 million years ago.
- Devonian Extinction: 365 million years ago.
- Permian-triassic Extinction: 250 million years ago.
- Triassic-jurassic Extinction: 210 million years ago.
- Cretaceous-tertiary Extinction: 65 Million Years Ago.
What are the 5 causes of extinction?
There are five major causes of extinction: habitat loss, an introduced species, pollution, population growth, and overconsumption.
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.
What is the major cause of the mass extinctions of species occurring today?
Extinction today Earth is currently experiencing a biodiversity crisis. Recent estimates suggest that extinction threatens up to a million species of plants and animals, in large part because of human activities such as deforestation, hunting, and overfishing.
What is the most endangered animal in the world 2020?
10 of the world’s most endangered animals
- Javan rhinoceros. An older Vietnamese stamp illustrates the Javan rhinoceros (Shutterstock)
- Vaquita.
- Mountain gorillas.
- Tigers.
- Asian elephants.
- Orangutans.
- Leatherback sea turtles.
- Snow leopards.
How does time exist?
Einstein’s general theory of relativity established time as a physical thing: it is part of space-time, the gravitational field produced by massive objects. The presence of mass warps space-time, with the result that time passes more slowly close to a massive body such as Earth.