Texas 8th Grade ELA Question of the Day

Initial passage (about 180 words): Astronomers recently reported detecting water vapor in the atmosphere of a distant exoplanet using a space telescope's infrared instruments. The planet, roughly twice Earth's size, orbits a star smaller than our Sun. As the planet passes in front of its star, starlight filtering through its atmosphere reveals chemical signatures. The initial analysis found a pattern consistent with water molecules, exciting scientists who study how planets form. Some headlines suggested the planet might be "like Earth" and therefore a good candidate for life. The research paper, however, cautioned that more observations were needed to understand temperature, clouds, and other gases. Still, the presence of water vapor somewhere in the atmosphere seemed clear from the first data set. Enthusiasts reasoned that if water vapor is present, liquid water oceans could be, too, at least under the right conditions.

Student's initial response: Given the evidence, I conclude this planet likely has liquid oceans and could support life.

New evidence: A follow-up observation measured the planet's dayside temperature at over 800 degrees, and models indicate high-altitude water vapor above thick clouds without surface water. The team clarified that "Earth-like" in some headlines referred only to size, not conditions.