The astronauts studied a massive c__________ on the surface of the moon, which was likely formed by an asteroid impact.
crater
After the explosion, pieces of d__________ were scattered across the surface of the spacecraft.
debris
Scientists fear that certain species may face e__________ due to environmental changes and human activity.
extinction
Some dinosaurs were h__________, feeding exclusively on plants rather than other animals.
herbivores
The astronaut observed a large w__________ of energy coming from the star, impacting nearby planets.
wave
The i__________ s__________ s__________ orbits Earth and serves as a research laboratory in space.
international space station
In z__________ g__________, objects float freely, creating a unique experience for astronauts.
zero gravity
The space s__________ carried a crew of astronauts to the International Space Station.
shuttle
O__________ s__________ is the vast region beyond Earth's atmosphere, where stars, planets, and galaxies are found.
outer space
The s__________ took a year to travel from Earth to Mars.
spacecraft
To improve energy efficiency, many people install h__________ i__________ to keep their homes warm in winter.
home insulation
Using a w__________ h__________, the astronaut could communicate hands-free during repairs.
wireless headset
To keep warm, hikers use f__________ b__________ that retain body heat.
foil blanket
The c__________ v__________ was invented as a convenient way to clean in small, hard-to-reach spaces.
cordless vacuum
Many mattresses today are made with m__________ f__________ to provide better support and comfort.
memory foam
An a__________ from space entered Earth’s atmosphere, burning brightly before breaking into pieces.
asteroid
