What does Rasmus Frisk mean by Temporary Use of Space" in urban design? What ways does he incorporate this into design?

All of these are describing which feature? located in north central asiastretches from the atlantic ocean to the red sea borders the sahara desert

The european union was formally established in

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks