Question on Newton's 1st law?

So i was reading Hawking's A Brief History of Time and it said that objects emit gravitational waves. Since releasing these waves uses it's energy, the object can then be expected to slow down and eventually stop. However, Newton's 1st law claims that an object in motion stays in motion unless acted... show more So i was reading Hawking's A Brief History of Time and it said that objects emit gravitational waves. Since releasing these waves uses it's energy, the object can then be expected to slow down and eventually stop. However, Newton's 1st law claims that an object in motion stays in motion unless acted upon by an outside force. The emission of gravitational waves wouldnt count as an outside force, would it? How does that work?
Update: I don't mean gravity from the outside acting UPON the object i'm talking about when the object EMITS it's own gravitational waves
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