1) The word "umbrella" contains three vowels: U, E, and A.

2) The first photograph of a black hole was captured in 2019 using a network of telescopes around the world.

3) The Earth's core is hotter than the surface of the Sun.

4) Greek mythology includes a wide array of gods and goddesses, such as Zeus, Poseidon, Athena, Aphrodite, and Apollo. These deities were believed to govern various aspects of life and the natural world and were often depicted with human characteristics and engaging in dramatic stories and conflicts.