"The Day the Sky Fell"

 Continuing the journey into the mysterious Earth

For children and curious minds of all ages

Yogendra Deva

 

Mihir burst into Aaba’s study without knocking—an unmistakable sign that something important had just happened.

“Aaba!” he exclaimed, slightly out of breath. “I just saw a shooting star!”

Aaba looked up from his notes, eyes twinkling.

“Oh, excellent,” he said. “Did you make a wish?”

Mihir made a face. “No! It disappeared before I could even think of one. It just… streaked across and vanished.”

Aaba leaned back. “That,” he said, “is the problem with shooting stars. They are not very patient with human wishes.”

Mihir pulled up a chair. “What was that, actually? A star doesn’t fall, does it?”

“Not really,” Aaba said. “Most of them burn up and vanish, but once in a while, a bigger piece makes it to the Earth… and if that happens—God bless us!”

Mihir grinned. “Good to know.”

“What you saw,” Aaba continued, “was a tiny piece of rock from space burning up as it entered Earth’s atmosphere.”

Mihir blinked. “You mean… a stone?”

“A very small one,” Aaba said. “Most of them are no bigger than a grain of sand. When they rush into the atmosphere at tremendous speed, they heat up and glow. That glowing streak is what we call a shooting star.”

Mihir sat back. “All this time… people have been making wishes on burning stones?”

“Romantically incorrect,” Aaba agreed. “Scientifically accurate.”

Mihir leaned forward again, now fully engaged.

“Space is throwing stones at Earth all the time?”

“Constantly,” Aaba said calmly.

Mihir stared at him. “That is not comforting.”

“Fortunately,” Aaba added, “almost all of them burn up completely before reaching the ground.”

“Where do these little pieces come from? The Moon?” Mihir asked, puzzled.

Aaba laughed heartily. “No, no. These travellers come from far deeper space—often from the asteroid belt. They journey millions of kilometres before meeting Earth.”

Mihir looked impressed. “What do we call these things?”

Aaba nodded approvingly. “Good question. In space, they are called meteoroids. When they enter the atmosphere and glow, they are meteors—your shooting stars. If any part survives and reaches the ground, it becomes a meteorite.”

Mihir repeated slowly, “Meteoroid… meteor… meteorite.”

 

"Exactly. Same traveller, different stages of the journey.”

“And what about bigger ones?” Mihir asked. “Surely not all of them are dust?”

“Indeed not,” Aaba said. “There are larger rocky bodies called asteroids—some of them several kilometres across.”

“Several kilometres?” Mihir’s eyebrows shot up. “That’s not a stone. That’s a mountain!”

“Quite right,” Aaba said. “A mountain that forgot where it was going.”

Mihir laughed. “And these mountains just… wander around in space?”

“Mostly in a region called the asteroid belt,” Aaba explained. “Occasionally, one of them strays.”

Mihir narrowed his eyes. “Strays… toward Earth?”

Aaba did not answer immediately.

“Before we come to that,” he said lightly, “let me ask you something.”

“What?”

“You have seen a shooting star today. Did it look dangerous?”

“No,” Mihir said. “Just a bright streak.”

“Exactly,” Aaba said. “Most of them are harmless. Once in a very long while… one is not.”

Mihir shifted in his chair.

“Has something like that ever happened?” he asked.

Aaba smiled faintly. “Ah, now we arrive at a rather famous story.”

He pointed to Mihir’s drawing lying on the carpet—a fierce T-Rex with very sharp teeth.

“You know,” he said, “there was a time when creatures like that ruled the Earth.”

“Of course,” Mihir said. “Dinosaurs ruled for millions of years.”

“Powerful,” Aaba added.

“Unstoppable,” Mihir said.

Aaba nodded slowly.

“And then,” he said quietly,
“one day… the sky fell.”

“Let’s see how it all happened,” Aaba continued.

About 66 million years ago, Earth was a lively place. Forests covered vast lands. Giant ferns and flowering plants flourished. Dinosaurs roamed freely—some enormous plant-eaters like Triceratops and Ankylosaurus, others fierce hunters like Tyrannosaurus rex. Flying reptiles ruled the skies, and the oceans held giant marine reptiles.

“It sounds like a prehistoric zoo,” Mihir said.

“Exactly,” Aaba laughed. “Except no cages.”

Far away in space, a massive asteroid moved silently through the solar system. About 10 kilometres wide—roughly the size of a small mountain—it travelled faster than a jet aircraft.

“Did dinosaurs see it coming?” Mihir asked.

“Very unlikely,” Aaba said. “It would have appeared only shortly before impact.”

Then came the moment.

The asteroid slammed into what is now the Yucatán Peninsula in Mexico, forming the gigantic Chicxulub crater, nearly 180 kilometres wide.

The energy released was unimaginable—far greater than billions of atomic bombs.

Shockwaves raced across continents. The ground shook violently.

“Tsunamis!” Mihir exclaimed.

“Exactly,” Aaba said. “Huge waves, hundreds of metres high.”

“But the real disaster came afterwards,” Aaba continued.

Dust, ash, and molten rock were blasted high into the atmosphere. A thick cloud spread around the planet. The sky darkened. Sunlight struggled to reach the ground.

For months—perhaps years—the Earth remained dim and cold.

“No sunlight… no plants,” Mihir said softly.

“And without plants,” Aaba replied, “the entire food chain collapses.”

“The giant plant-eating dinosaurs starved first,” Aaba said.
“Then the meat-eaters followed.”

Mihir sat quietly.

“Creatures that once ruled the Earth… gone.”

“In difficult times,” Aaba said gently, “being small can be an advantage.”

“Who survived?” Mihir asked.

“Small mammals, birds, insects—creatures that could adapt.”

“Birds?” Mihir asked suddenly.

Aaba smiled. “Birds are distant descendants of dinosaurs.”

Mihir burst out laughing. “A pigeon related to T-Rex?”

“Very distant cousins,” Aaba said. “Family resemblance requires imagination.”

“For a long time,” Aaba continued, “scientists did not know why dinosaurs vanished.”

They discovered a thin layer of rock around the world rich in iridium—rare on Earth, common in meteorites. Shocked quartz and tiny glass beads added to the evidence. Finally, the Chicxulub crater completed the puzzle.

“Science,” Aaba said, “often works like detective work.”

Mihir looked thoughtful.

“Have such impacts happened in India too?”

Aaba nodded.

“Yes. There is a famous one in Maharashtra—the Lonar Crater. Much smaller than Chicxulub, of course, but still a remarkable reminder that space has visited our land as well.”

Mihir’s eyes widened. “So even India has been hit?”

“Gently,” Aaba smiled. “Compared to the dinosaur-ending one.”

After a pause, Mihir spoke again.

“One wandering asteroid changed everything.”

“That is correct,” Aaba replied. “A simple cosmic accident reshaped life on Earth.”

“What happened after that?” Mihir asked.

“Life returned,” Aaba said. “Plants grew again. Small mammals spread and evolved.”

“And eventually…” Mihir said.

“…humans,” Aaba nodded.

Mihir picked up his drawing.

“If that asteroid had missed Earth…”

“Yes?”

“Dinosaurs might still be ruling the planet.”

Aaba smiled.

“And perhaps,” he said,
“a curious dinosaur would be asking questions about mysterious little mammals.”

Mihir laughed… then paused.

“All those plants and animals that died… what happened to them?”

Aaba’s voice softened.
“Many were buried under layers of sediments over millions of years.”

“And then?”

Aaba leaned back, a faint smile forming as if he had reached the edge of one story and was looking into another.

“After the dinosaurs vanished,” he said slowly, “the Earth did not simply become quiet. It changed in ways that would shape the future… far beyond what anyone could imagine.”

Mihir waited.

“Some of those changes,” Aaba continued, “deep beneath the ground… would one day make certain regions of the world incredibly important.”

“That,” he added,
“is a story for another evening.”