Black hole offering | offering: A thing offered, esp. as a gift or contribution ... A thing produced or manufactured for entertainment or sale | up cosmic surprise | surprise: An unexpected or astonishing event, fact, or thing ... A feeling of mild astonishment or shock caused by something unexpected | - United Press International CAMBRIDGE, Mass., Feb. 21 (UPI) -- U.S. astronomers | astronomers: An expert in or student of astronomy ... (astronomer) a physicist who studies astronomy | say they used an X-ray observatory | observatory: A room or building housing an astronomical telescope | telescope: An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified ... Cause (an object made of concentric tubular parts) to slide into itself, so that it becomes smaller | or other scientific equipment for the study of natural phenomena ... A position or building affording an extensive view | to clock the fastest particle | particle: A minute portion of matter ... The least possible amount | wind yet discovered | discovered: Find (something or someone) unexpectedly or in the course of a search ... Become aware of (a fact or situation) | blowing off a disk around a stellar-mass black hole. Researchers | Researchers: (research) attempt to find out in a systematically and scientific manner; ... (research) systematic investigation to establish facts | at the Chandra X-Ray Observatory Center at ...

Big questions | questions: Ask emquestions/em of (someone), esp. in an official context ... Feel or express doubt about; raise objections to | need a big telescope - ABC Online Second, by tracking | tracking: The action of emtracking/em someone or something ... The maintenance of a constant difference in frequency between two or more connected circuits or components | the precise motions of stars orbiting | orbiting: (of a celestial object or spacecraft) Move in emorbit/em around (a star, planet, or moon) ... Fly or move around in a circle | the super-massive black hole at the centre of our galaxy ... by detecting | detecting: Discover or identify the presence or existence of ... Discover or investigate (a crime or its perpetrators) | the motions of stars bobbing up and down like little boats on a cosmic swell. These observations | observations: The action or process of observing something or someone carefully or in order to gain information ... The ability to notice things, esp. significant details | are almost impossible | impossible: Not able to occur, exist, or be done ... Very difficult to deal with | ...