Our planet has a celestial sentry leading the way around the sun, and it's only the second Earth Trojan asteroid ever discovered
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Our planet has a celestial sentry leading the way around the sun, and it's only the second Earth Trojan asteroid ever discovered.
Astronomers observed asteroid 2020 XL5 using the Southern Astrophysical Research Telescope in Chile. A study detailing the discovery of the Earth Trojan asteroid published Tuesday in the journal Nature Communications.
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