The GALEX observatory was a recent observatory. that was launched to observe over a half-billion galaxies going back to when our Universe was just about 3 billion years old. It used wavelengths of higher energy than visible light. Which of these could describe the wavelengths used by the GALEX observatory to make observations in space? A. microwaves
B. radio waves
C. Infrared waves
D. ultraviolet waves

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

What is friction? how does it affect the motion of an object?