The Arabian desert is one of the biggest deserts in the world. It is also one of the hottest and driest places on the planet. This desert occupies almost all of the Arabian Peninsula, with only parts of the coastline and the mountains along the southern half of the coastline of the peninsula, not being part of it.
In one way or another, most of the desert have some water bodies in them, be it a river or a lake. The Arabian Desert actually doesn't have a single river in it despite its vastness. Because of the harshness of the desert, there's very few people living in it, with almost all of the population on the peninsula being located along the coastline.
Weather describes the condition of the atmosphere over a short period of time e.g. from day to day or week to week, while climate describes average conditions over a longer period of time. The climate of an area or country is known through the average weather over a long period of time.
Deep space telescopes are fitted with the faint object cameras, that are way better than ground-based spectroscopically functioning telescopes. The Subaru telescope at Hawaii observed the faintest object ever from a ground-based telescope. But when compared to other deep-space telescopes like Hubble's deep space telescopes it's very small. They have reached up to a magnitude of 31 , which observes 20 times fainter objects .