There is no oxygen outside the atmosphere then how does the sun ☀ lit himself for others ...,.
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Answer:
Mercury is the smallest and least massive of the eight planets. Its low surface gravity makes holding on to an atmosphere in the best of circumstances a challenge.
But Mercury isn't ideally located for an atmosphere. Orbiting only a few million miles from the sun, the rocky planet is constantly bombarded by solar weather. The fast-moving winds blowing off the star constantly bombard Mercury, crashing charged particles into the planet's surface. Both the particles themselves and the heat they produce kick material up from the outer layer of the planet, sending it flying into the air. The heaviest atoms drift back to the surface, while the lightest are affected by gravity and by pressure from solar photons. The result is a tenuous atmosphere known as an exosphere.
In the past, scientists had to rely on brief glimpses captured by NASA's Mariner 10 spacecraft and Earth-based instruments studied the world's features as it crossed in front of the sun. Once NASA's MErcury Surface Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission entered orbit around the planet, however, it could provide a more comprehensive look that helped clear up incorrect estimates made by earlier snapshots.
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Answer:
WE KNOW THAT LIGHT DO NOT WANT ANY MEEDIUM TO TRAVEL SO BY THAT SUN RAYS ENTER IN THE EARTH'S ATMOSPHERE.