1·But a bunch of strong extragalactic microwave - and radio-sources are out there too, mucking up our picture!
而且有一群强大的银河系外微波和无线电源，弄脏了我们的图片！
2·Astronomer Art Hoag first asked this question when he chanced upon this unusual extragalactic object.
当天文学家阿特·霍格偶然发现这个银河系外的非同一般的物体时，他首先问出来这个问题。