<p>A quick <a href="https://www.google.com.au/search?q=does%20space%20have%20gravity%3F&amp;ie=utf-8&amp;oe=utf-8&amp;gws_rd=cr&amp;ei=MjS0VpmUJMm20AT0xq_YBw" rel="nofollow">search</a> up on google you would find this:</p>

<blockquote>
  <p>Gravity causes every object to pull every other object toward it. <strong>Some
  people think that there is no gravity in space. In fact, a small
  amount of gravity can be found everywhere in space.</strong> Gravity is what
  holds the moon in orbit around Earth.</p>
</blockquote>

<p>Why is this? That's <a href="https://www.google.com.au/search?q=what%20is%20pace%20made%20of%3F&amp;ie=utf-8&amp;oe=utf-8&amp;gws_rd=cr&amp;ei=GjS0VtWXB4Kw0gSgkpagBQ#q=what%20is%20space%20made%20of%3F" rel="nofollow">because</a>:</p>

<blockquote>
  <p>Outer space is the closest known approximation to a perfect vacuum. It
  has effectively no friction, allowing stars, planets and moons to move
  freely along their ideal orbits. However, even the deep vacuum of
  intergalactic space is not devoid of matter, as <strong>it contains a few
  hydrogen atoms per cubic meter.</strong></p>
</blockquote>

<p>If there's matter in space, thus this makes <a href="https://www.google.com.au/search?q=does%20any%20object%20have%20gravity&amp;ie=utf-8&amp;oe=utf-8&amp;gws_rd=cr&amp;ei=FUC0VvmEOObImAW61JigCw" rel="nofollow">this statement</a> valid. </p>

<blockquote>
  <p>Yes, <strong>everything that has mass will cause a gravitational pull on other
  objects</strong>.</p>
</blockquote>

CC BY-SA 3.0
2016-02-05T15:59:13.870Z
This isn't really an answer. The OP states that the universe has "objects" and "space" and wants to know if the "space" has gravity. Your answer boils down to "there are objects throughout space, and objects have gravity".
JBentley
CC BY-SA 3.0
2016-02-05T06:35:21.270Z
2016-02-05T06:35:21.270Z
CipherBot
<p>In the intergalactic medium — the most dilute regions of the Universe between the galaxies — as CipherBot writes you'll find roughly one hydrogen per cubic meter, i.e. the density is $\sim10^{-6}\,\mathrm{atoms}\,\mathrm{cm}^{-3}$, or $\sim10^{-30}\,\mathrm{g}\,\mathrm{cm}^{-3}$, or, in terms of energy (since mass and energy are equivalent through $E=mc^2$), $\sim10^{-9}\,\mathrm{erg}^\dagger$. In addition to this, you'll find 5–6 times as much dark matter.</p>

<p>Space itself can't really be considered "an object". Nevertheless, even ignoring the normal and dark matter, space does have energy: the so-called <em>dark energy</em>. We don't really know much about it, but we  can measure its presence through its effect on the expansion of the Universe. But whereas normal and dark matter decelerates this expansion, dark energy has the opposite effect of accelerating the expansion. And since the energy density of dark energy is more than twice that of the other two components together, it actually dominates the dynamics of the Universe.</p>

<p>So, in this regard you can say that space does have gravity, although it's a "negative gravity". This phrasing is a bit misinterpreted, though. The dark energy is thought to be a negative <em>pressure</em>. Pressure has a energy density associated with is, so negative pressure has a negative energy density.</p>

<p>$^\dagger$<sub>$1\,\mathrm{erg}\equiv10^{-7}\,\mathrm{Joule}$.</sub></p>

CC BY-SA 4.0
2023-03-20T13:33:20.357Z
Let's say you're trapped inside the earth's core (ignoring the heat). How would gravity act upon your body? Will it rip you apart considering there's a large mass distributed equally around you?
ATL_DEV
CC BY-SA 4.0
2023-03-20T16:04:56.647Z
@ATL_DEV You'll only be ripped apart if the _gradient_ of the gravitational field — i.e. how fast it changes with position — is stronger than the molecular bonds of your body, and that requires much stronger fields than Earth's; only found around black holes. Moreover, if you're _inside_ a spherical mass, [it can be shown](https://en.wikipedia.org/wiki/Shell_theorem) that you only feel the gravitational field of the mass closer to the center than your position — the mass farther away turns out to cancel in effect.
pela
CC BY-SA 4.0
2023-03-20T16:05:19.640Z
Btw. the scientific term for being ripped apart is to be [spaghettified](https://en.wikipedia.org/wiki/Spaghettification) :)
pela
CC BY-SA 3.0
2016-02-05T09:35:43.813Z
2016-02-05T09:35:43.813Z
pela
<p>My science teacher told me that every object in Universe has gravity but space is a part of Universe too, so,  <strong>why does the space have no gravity?</strong></p>

CC BY-SA 3.0
2018-03-10T19:28:58.530Z
Are you saying that "space" is an "object"? I don't think that's what your teacher meant.
Steve Linton
CC BY-SA 3.0
2018-03-10T19:32:33.373Z
When you say "space has no gravity" do you mean that empty space doesn't pull things towards it (which is more or less true) or are you referring to the way astronauts (and other things) float around in space and are not pulled towards the floor of the ISS or whatever. That's because the floor and the astronaut are being pulled equally be Earth's gravity and constantly falling around the Earth. There is a gravitational force between the astronaut and the ISS (or anything else in it) but it is too weak to notice without sensitive instruments. Can you clarify?
Steve Linton
<gravity><universe><space>
Does every object in the Universe have gravity? Space has no gravity, why?
ciara
# Does every object in the Universe have gravity? Space has no gravity, why?

(Asked by: username_0 on 2016-02-05)

My science teacher told me that every object in Universe has gravity but space is a part of Universe too, so, **why does the space have no gravity?**

**Tags:** gravity, universe, space

> **Comments:**
> **username_1**: Are you saying that "space" is an "object"? I don't think that's what your teacher meant.  
> **username_1**: When you say "space has no gravity" do you mean that empty space doesn't pull things towards it (which is more or less true) or are you referring to the way astronauts (and other things) float around in space and are not pulled towards the floor of the ISS or whatever. That's because the floor and the astronaut are being pulled equally be Earth's gravity and constantly falling around the Earth. There is a gravitational force between the astronaut and the ISS (or anything else in it) but it is too weak to notice without sensitive instruments. Can you clarify?  

---

## 2 answers

### Answer by username_2 on 2016-02-05. Score: 3

A quick [search](https://www.google.com.au/search?q=does%20space%20have%20gravity%3F&ie=utf-8&oe=utf-8&gws_rd=cr&ei=MjS0VpmUJMm20AT0xq_YBw) up on google you would find this:

> Gravity causes every object to pull every other object toward it. **Some
> people think that there is no gravity in space. In fact, a small
> amount of gravity can be found everywhere in space.** Gravity is what
> holds the moon in orbit around Earth.

Why is this? That's [because](https://www.google.com.au/search?q=what%20is%20pace%20made%20of%3F&ie=utf-8&oe=utf-8&gws_rd=cr&ei=GjS0VtWXB4Kw0gSgkpagBQ#q=what%20is%20space%20made%20of%3F):

> Outer space is the closest known approximation to a perfect vacuum. It
> has effectively no friction, allowing stars, planets and moons to move
> freely along their ideal orbits. However, even the deep vacuum of
> intergalactic space is not devoid of matter, as **it contains a few
> hydrogen atoms per cubic meter.**

If there's matter in space, thus this makes [this statement](https://www.google.com.au/search?q=does%20any%20object%20have%20gravity&ie=utf-8&oe=utf-8&gws_rd=cr&ei=FUC0VvmEOObImAW61JigCw) valid.

> Yes, **everything that has mass will cause a gravitational pull on other
> objects**.

> **Comments:**
> **username_3**: This isn't really an answer. The OP states that the universe has "objects" and "space" and wants to know if the "space" has gravity. Your answer boils down to "there are objects throughout space, and objects have gravity".  

---

### Answer by username_4 on 2016-02-05. Score: 2

In the intergalactic medium — the most dilute regions of the Universe between the galaxies — as username_2 writes you'll find roughly one hydrogen per cubic meter, i.e. the density is $\sim10^{-6}\,\mathrm{atoms}\,\mathrm{cm}^{-3}$, or $\sim10^{-30}\,\mathrm{g}\,\mathrm{cm}^{-3}$, or, in terms of energy (since mass and energy are equivalent through $E=mc^2$), $\sim10^{-9}\,\mathrm{erg}^\dagger$. In addition to this, you'll find 5–6 times as much dark matter.

Space itself can't really be considered "an object". Nevertheless, even ignoring the normal and dark matter, space does have energy: the so-called *dark energy*. We don't really know much about it, but we can measure its presence through its effect on the expansion of the Universe. But whereas normal and dark matter decelerates this expansion, dark energy has the opposite effect of accelerating the expansion. And since the energy density of dark energy is more than twice that of the other two components together, it actually dominates the dynamics of the Universe.

So, in this regard you can say that space does have gravity, although it's a "negative gravity". This phrasing is a bit misinterpreted, though. The dark energy is thought to be a negative *pressure*. Pressure has a energy density associated with is, so negative pressure has a negative energy density.

$^\dagger$$1\,\mathrm{erg}\equiv10^{-7}\,\mathrm{Joule}$.

> **Comments:**
> **username_5**: Let's say you're trapped inside the earth's core (ignoring the heat). How would gravity act upon your body? Will it rip you apart considering there's a large mass distributed equally around you?  
> **username_4**: @username_5 You'll only be ripped apart if the _gradient_ of the gravitational field — i.e. how fast it changes with position — is stronger than the molecular bonds of your body, and that requires much stronger fields than Earth's; only found around black holes. Moreover, if you're _inside_ a spherical mass, [it can be shown](https://en.wikipedia.org/wiki/Shell_theorem) that you only feel the gravitational field of the mass closer to the center than your position — the mass farther away turns out to cancel in effect.  
> **username_4**: Btw. the scientific term for being ripped apart is to be [spaghettified](https://en.wikipedia.org/wiki/Spaghettification) :)  

---

