Can space/time exist without matter?

Can space/time exist without matter?

Can space exist by itself without matter or energy around? No. General relativity tells us that what we call space is just another feature of the gravitational field of the universe, so space and space-time can and do not exist apart from the matter and energy that creates the gravitational field.

What is the absence of energy?

Absolute zero is the theoretical temperature where energy reaches zero, however it is impossible to reach. It breaks certain laws of physics, specifically the 1st and 2nd laws of thermodynamics.

What does vacuum mean?

Vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).

Is vacuum really empty?

2 Answers. Vacuum is in fact not empty. According to our current understanding all of space is permeated by fields which due to quantum mechanical effects only tend around a zero energy value. This means that the vacuum is subject to fluctuations in the fields permeating it.

Are humans empty space?

Every human on planet Earth is made up of millions and millions of atoms which all are 99% empty space. If you were to remove all of the empty space contained in every atom in every person on planet earth and compress us all together, then the overall volume of our particles would be smaller than a sugar cube.

Is there a God of nothing?

PEMBA – the Bambara God of Nothing (African mythology)

What color do you bleed in space?

This leaves only high-energy blue light to be reflected from our maroon veins. So, if you cut yourself in space, your blood would be a dark-red, maroon color.

What happens if you get hurt in space?

In the case of a true medical emergency—one that requires surgery—evacuation to Earth is currently the only way for astronauts to get treatment. Surgery in zero gravity isn’t yet possible; blood would float straight out of a wound and contaminate the whole cabin.

Does blood clot in space?

There are, however, real physical risks to being in space. Earlier this year, an unnamed astronaut developed a blood clot in space for the first time – a common health problem which affects at least one person in 1000 on Earth.

Do cuts heal in space?

Deep space missions will boost crew exposure to long-term microgravity, or weightlessness, and reduced gravity, according to the 100 Year Starship Project. Such low-gravity environments slow wound and fracture healing and accelerate bone loss, muscle loss and certain aspects of aging.

Can you do surgery in space?

Surgery in microgravity is possible and has already been been carried out, albeit not on humans yet. For example, astronauts have managed to repair rat tails and perform laparoscopy – a minimally invasive surgical procedure used to examine and repair the organs inside the abdomen – on animals, while in microgravity.

How do astronauts prevent blood clots?

Treatment process The astronaut’s blood clot was treated with Enoxaparin — a drug delivered by an injection into the skin — for about 40 days. On the 43rd day of the astronaut’s treatment, a supply of Apixaban — a pill taken orally — arrived at the ISS on an unspecified cargo resupply spacecraft.

What would happen to your lungs in space?

Upon sudden decompression in vacuum, expansion of air in a person’s lungs is likely to cause lung rupture and death unless that air is immediately exhaled. Contrary to how the lungs are supposed to function at atmospheric pressure, oxygen diffuses out of the bloodstream when the lungs are exposed to a vacuum.

What is the average lifespan of an astronaut?

The average age for active women astronauts is 39.9 years while the same average for active men is 41.9 years. For inactive corps members, men have a mean age of 50.9 years while women have a mean age of 46.5 years.

Do astronauts go to the bathroom in their suits?

It is worn by both male and female astronauts. Astronauts can urinate into the MAG, and usually wait to defecate when they return to the spacecraft. However, the MAG is rarely used for this purpose, since the astronauts use the facilities of the station before EVA and also time the consumption of the in-suit water.