Which passage maintains a formal style?
1. No photographs of black holes existed until 2019. Finally, a big fat
telescope caught a snapshot of one. The picture shows a ring of
orange light surrounding a black hole.
2. In 2012, NASA sent a rover called Curiosity to Mars. It can
analyze soil samples and take photographs of the surface of the
planet. The rover transmits this information back to scientists.
3. Scientists are always exploring new questions by using the
scientific method. The method offers a way to gather evidence
that can be used to draw conclusions. That's how scientists figure
out everything.
4. When Ancient Athens fought a war against Sparta around 430
BCE, Athenians began to get sick. Crowded into sheltered places
to stay safe, the people of Athens experienced a terrible plague.
The war effort was kinda slowed down because of that.
