Australia is both a country and a continent, making it unique in the world. Australia is the smallest continent, covering about 7.7 million square kilometers (2.97 million square miles). It lies in the Southern Hemisphere, between the Indian and Pacific Oceans, and is entirely surrounded by water. Australia's physical separation from other landmasses has resulted in unique biodiversity and ecosystems.

The universe is all of space and time and their contents. It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments.

South America is the fourth largest continent in the world, located entirely in the Western Hemisphere. It's bordered on the west by the Pacific Ocean, on the north and east by the Atlantic Ocean, and by the Caribbean Sea to the northwest. South America is connected to North America by the Isthmus of Panama. It had a population of 434,254,119 in 2021.

Asia, the largest continent on Earth, is a diverse and culturally rich region encompassing a wide range of environments, economies, and societies. It has approximately 44.58 million square kilometers (17.21 million square miles) with over 4.6 billion people, making up about 60% of the world's population.

Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It comprises the westernmost part of Eurasia and is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east.

Africa is a diverse and vast continent composed of 54 countries, each with its own unique cultural, historical, and geographical attributes. Africa is traditionally divided into several regions, including North Africa, West Africa, Central Africa, East Africa, and Southern Africa.

Antarctica is the southernmost continent on Earth, situated almost entirely within the Antarctic Circle. It's the fifth-largest continent by land area, covering approximately 14 million square kilometers (5.4 million square miles), making it larger than Europe and almost twice the size of Australia.