The animation below illustrates how gravitational waves are emitted by two neutron stars as they first orbit each other and then coalesce. Though gravitational waves were predicted to exist in 1916, actual proof of their existence wouldn't arrive until 1974, 20 years after Einstein's death.
Uroabdomen can result from various causes, but the most common is related to trauma. Damage to the kidney, ureter, bladder, or urethra may cause urine to leak into the abdomen. Some common forms of trauma that can result in a disruption of the urinary tract in cats include:
Many-a-time, it is hard for a woman to know whether she is leaking amniotic fluid or urine. During the final trimester, the fetus exerts immense pressure on the body, and it can cause discharge, which is quite normal. The baby will also place pressure on the bladder and it can lead to urine leakage.