Black Holes -- What methods to use to find them?

[jha192001]

How many are the ways a Black hole without *ACCERTION DISK* can be spotted?

 

[Ibix]

How many ways have you thought of?

 

[Matterwave]

A couple other ways I can think of:

1. Orbits of stars nearby.
2. Gravitational micro-lensing.
3. Gravitational waves (if two black holes are orbiting each other).
4. Sending in TARS or CASE.

 

[phinds]

A couple other ways I can think of:

1. Orbits of stars nearby.
2. Gravitational micro-lensing.
3. Gravitational waves (if two black holes are orbiting each other).
4. Sending in TARS or CASE.

So, we are no longer expecting the OP to do some work before we give answers? Did you think ibix was not aware of these?

 

[Matterwave]

So, we are no longer expecting the OP to do some work before we give answers? Did you think ibix was not aware of these?

Well, I thought sending in TARS or CASE was pretty clever... On a more serious note, I thought OP's question was simple enough that it didn't require the back and forth of asking OP to search elsewhere first. I generally leave the "please show effort" kind of responses to the Homework forum or for questions that are far too broad to answer concisely. If it's PF's current policy (I've been gone for a few years) that OP needs to show effort here as well, I can redact my post.

 

[berkeman]

No need to redact now that the OP has seen it. But yes, a common theme lately has been to try to get (especially new) users used to showing their efforts when they ask questions.

Great to have you back, @Matterwave -- you have been missed!

 

[berkeman]

4. Sending in TARS or CASE.

And I had to Google this one -- I learned something new!

 

[Matterwave]

No need to redact now that the OP has seen it. But yes, a common theme lately has been to try to get (especially new) users used to showing their efforts when they ask questions.

Great to have you back, @Matterwave -- you have been missed!

Ok, I will keep this in mind in the future. And, thanks! :D

 

[phinds]

Ok, I will keep this in mind in the future. And, thanks! :D

Sorry, I didn't realize you had been away for a while. I though you were just forgetting the standards for a moment.