The scientists used the European Space Agency's XMM-Newton X-ray space telescope to study the BL Lacertae quasar 1ES 1553+113, an active, supermassive black hole at the centre of a galaxy. Matter of fact Outside those astronomical objects listed in Table 1, there is another X-ray source...
You find variety to be the spice of life. If you answered mostly3, then head straight for the Italian aisle. Chianti is a great classic wine. You have an old-world sensibility and find joy in traditions. If you answered mostly4, you should be drinking Cotes-du-Rhone from France. The ...