The Sun
The distance between the Sun and Earth
What is 93,000,000 miles?
A planet, like Mercury, that is made mostly of solid rock that you can stand on
What is a terrestrial planet?
The molten rock that reaches the surface after erupting from a volcano, like the ones on Venus
What is lava?
The gas in Earth's atmosphere that is the most important to our survival
What is oxygen?
The color of the Moon during a lunar eclipse because of sunlight shining through the Earth's atmosphere
What is red?
Dark spots on the Sun that are cooler than the rest of its surface
What are sunspots?
The first spacecraft to visit Mercury in 1973
What is Mariner 10?
The poisonous gas in the clouds on Venus
What is crust, mantle, outer core, and inner core?
The word used in reference to the Moon
What is lunar?
When the Sun is completely hidden behind the Moon
What is a solar eclipse?
The temperature on Mercury during the day
What is about 800 degrees Fahrenheit?
The method astronomers use to map the surface of Venus
What is radar?
The imaginary line that divides the Earth into the Northern and Southern Hemispheres
What is the equator?
The first astronaut to set foot on the Moon
Who is Neil Armstrong?
The small explosions that happen over and over again deep inside the Sun that give it energy
What is thermonuclear fusion?
The time it takes for Mercury to make one complete rotation
What is 59 Earth days?
The temperature on Venus all the time
What is about 870 degrees?
The big ball of magnetic power that protects the Earth from harmful particles from the Sun
What is the magnetosphere?
Smooth, flat plains on the Moon caused by ancient lava flows
What are maria?
Small points of light that appear around the edges of the Moon during an eclipse
What are Bailey's Beads?
The distance between Mercury and the Sun
What is 36 million miles?
The time it takes Venus to revolve around the Sun, which is shorter than its rotational period
What is 225 Earth days?
The angle measurement of the Earth's axial tilt?
What is 23 degrees?
The fraction of your weight on Earth that you would weigh on the Moon
What is 1/6?