<p><strong>NOTE: My answer is now complete. Thank you for your patience while I edit.</strong></p>
<p>To answer your question, there are a lot of context clues given through the dialogue in each episode. I will point these out then list my answer below.</p>
<h1><strong>What we know</strong></h1>
<h3>Firstly</h3>
<p>When Beerus found out that Bulma built a time machine, he mentioned that time travel or tampering with the future is highly forbidden even for gods, and that he should destroy her right now for committing such a great offense.</p>
<p>This proves that gods have knowledge of time travel and have rules in-place for protecting continuity of the timeline. Also, he never scolds Whis for using time manipulation twice (once against Freeza and once to save Gowasu in the present), also proving that angels do not follow the same protocol as gods and humans.</p>
<h3>Secondly</h3>
<p>Gowasu takes Zamasu to a distant planet to observe a human-like species in development. He scolds him for killing a human once they went a few thousand years into the future because Zamasu committed an action that could have changed how that entire species would develop.</p>
<p>This proves that gods are forbidden to travel unless certain circumstances arise, but are also expressly forbidden from interacting with things in the future or past.</p>
<h3>Lastly</h3>
<p>Zamasu and Black both state in the battle with Trunks (the specific battle was the one where he transformed into a hybrid of SSB and SS2) that it is because of Trunks's actions during the Cell/Android saga of jumping back and forth through time that really helped them come to the conclusion that humans need to be destroyed.</p>
<h2>My Answer</h2>
<p>With those 3 key pieces of evidence, it is very apparent that gods can time travel and they can do so at will, but they MUST exercise a great deal of discretion and restraint when doing so and should only do it under certain circumstances.</p>
<p>Gowasu could have looked into the future to predict his death, betrayal and all of that, but if he did he would have arbitrarily taken actions to protect himself and changed the timeline which was forbidden. Now maybe he knew that and maybe he didn't.</p>
<p>However, Gowasu has stated that the role of a Kai (God) is to observe. So I highly doubt he would ever look into the future. His whole reason for even using the time ring the one time that he did was to prove a point to his student.</p>
<p>So in short, yes, Gowasu could have gone ahead and prevented Black's existence. But if he did, it would do 3 things:</p>
<ul>
<li>Contradict his character</li>
<li>Ruin Black's existence</li>
<li>Make the current story arc (<em>which I find very entertaining</em>) disappear entirely.</li>
</ul>

CC BY-SA 3.0
2016-10-26T16:01:08.010Z
+1, it is highly likely that Gowasu only went into the future once in a very long time, and that was with Zamasu which we saw. He probably would not risk breaking the rules by going into the future to learn about His and Zamasus future, believing instead that Zamasu was just being a rebellious teenager, and one day would become like him. Though he may have known and been pretending, It did seem like everyone was fooled and believed Present Zamasu was not evil until shortly before he killed Gowasu (and Whis reversed it)
Ryan
CC BY-SA 3.0
2016-10-26T16:43:28.847Z
@Ryan thank you for your comment. Though this is my own speculation I suspect it was the sparring match with Goku that pushed him over the edge. First he was disgusted with humanlike creatures. After his battle with Goku he became afraid and angry.
Callat
CC BY-SA 3.0
2016-10-26T19:50:50.833Z
It probably will fully end up being speculation and not fully explained, but it was confirmed that Black was Zamasu who took Goku's body, which I believe he said happened because he fought Goku. This is Anime only though, since it looks like the Manga might take a slightly different path since it was Kibito instead of Goku who Zamasu spared with when he was introduced. Though Goku may still spar with him later.
Ryan
CC BY-SA 3.0
2016-10-26T15:13:12.190Z
2017-01-17T08:37:52.053Z
2020-06-17T09:17:53.303Z
Callat
<p>If Gowasu can really travel to future at any point of time, why didn't he foresee Zamasu turning rogue in the first place?. He could have foreseen this even at the time of choosing Zamasu as his apprentice?</p>

CC BY-SA 3.0
2016-10-25T15:21:10.693Z
Just because you can does not mean you should, and just because he was in the future does not mean he will discover everything. As well, I wonder if which ring you wear determines what future you go to, Since Future Trunks time line is different Than the main timeline, and its the Future Trunks timeline that he goes to.
Ryan
CC BY-SA 3.0
2016-10-28T09:58:05.440Z
@Ryan From the point of view of the gods, the Future-Trunks timeline is the primary branch. The silver time ring corresponds to this branch. Gowasu explained that whenever an alternate timeline is created, a new green time ring appears, and that the four alternate timelines are due to "some idiot mortal fooling around with time-travel".
David H
<dragon-ball-series><dragon-ball-super>
Why Gowasu didn't foresee that Zamasu will turn rogue?
# Why Gowasu didn't foresee that Zamasu will turn rogue?
Posted by: username_0 on 2016-10-25
If Gowasu can really travel to future at any point of time, why didn't he foresee Zamasu turning rogue in the first place?. He could have foreseen this even at the time of choosing Zamasu as his apprentice?
**Tags:** dragon-ball-series dragon-ball-super
> **Comments:**
> **username_1**: Just because you can does not mean you should, and just because he was in the future does not mean he will discover everything. As well, I wonder if which ring you wear determines what future you go to, Since Future Trunks time line is different Than the main timeline, and its the Future Trunks timeline that he goes to.  
> **username_2**: @Ryan From the point of view of the gods, the Future-Trunks timeline is the primary branch. The silver time ring corresponds to this branch. Gowasu explained that whenever an alternate timeline is created, a new green time ring appears, and that the four alternate timelines are due to "some idiot mortal fooling around with time-travel".  
---
## 1 answers
### Answer by username_3 on 2016-10-26. Score: 4
**NOTE: My answer is now complete. Thank you for your patience while I edit.**

To answer your question, there are a lot of context clues given through the dialogue in each episode. I will point these out then list my answer below.

# **What we know**

### Firstly

When Beerus found out that Bulma built a time machine, he mentioned that time travel or tampering with the future is highly forbidden even for gods, and that he should destroy her right now for committing such a great offense.

This proves that gods have knowledge of time travel and have rules in-place for protecting continuity of the timeline. Also, he never scolds Whis for using time manipulation twice (once against Freeza and once to save Gowasu in the present), also proving that angels do not follow the same protocol as gods and humans.

### Secondly

Gowasu takes Zamasu to a distant planet to observe a human-like species in development. He scolds him for killing a human once they went a few thousand years into the future because Zamasu committed an action that could have changed how that entire species would develop.

This proves that gods are forbidden to travel unless certain circumstances arise, but are also expressly forbidden from interacting with things in the future or past.

### Lastly

Zamasu and Black both state in the battle with Trunks (the specific battle was the one where he transformed into a hybrid of SSB and SS2) that it is because of Trunks's actions during the Cell/Android saga of jumping back and forth through time that really helped them come to the conclusion that humans need to be destroyed.

## My Answer

With those 3 key pieces of evidence, it is very apparent that gods can time travel and they can do so at will, but they MUST exercise a great deal of discretion and restraint when doing so and should only do it under certain circumstances.

Gowasu could have looked into the future to predict his death, betrayal and all of that, but if he did he would have arbitrarily taken actions to protect himself and changed the timeline which was forbidden. Now maybe he knew that and maybe he didn't.

However, Gowasu has stated that the role of a Kai (God) is to observe. So I highly doubt he would ever look into the future. His whole reason for even using the time ring the one time that he did was to prove a point to his student.

So in short, yes, Gowasu could have gone ahead and prevented Black's existence. But if he did, it would do 3 things:

* Contradict his character
* Ruin Black's existence
* Make the current story arc (*which I find very entertaining*) disappear entirely.
> **Comments:**
> **username_1** (2016-10-26): +1, it is highly likely that Gowasu only went into the future once in a very long time, and that was with Zamasu which we saw. He probably would not risk breaking the rules by going into the future to learn about His and Zamasus future, believing instead that Zamasu was just being a rebellious teenager, and one day would become like him. Though he may have known and been pretending, It did seem like everyone was fooled and believed Present Zamasu was not evil until shortly before he killed Gowasu (and Whis reversed it)  
> **username_3** (2016-10-26): @Ryan thank you for your comment. Though this is my own speculation I suspect it was the sparring match with Goku that pushed him over the edge. First he was disgusted with humanlike creatures. After his battle with Goku he became afraid and angry.  
> **username_1** (2016-10-26): It probably will fully end up being speculation and not fully explained, but it was confirmed that Black was Zamasu who took Goku's body, which I believe he said happened because he fought Goku. This is Anime only though, since it looks like the Manga might take a slightly different path since it was Kibito instead of Goku who Zamasu spared with when he was introduced. Though Goku may still spar with him later.  
---
