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

2) The word "triangle" contains four vowels: I, A, E, and E.

3) The recent advancements in space exploration include missions to Mars by various space agencies, such as NASA's Perseverance rover landing on Mars in 2021, aiming to explore the planet's geology and search for signs of past microbial life.

4) The term "bull market" refers to a period of rising stock prices, while a "bear market" refers to a period of falling stock prices.