Our galaxy probably contains at least 2 billion planets like Earth.
When astronauts first shaved in space, their weightless whiskers floated up to the ceiling. A special razor had to be developed which drew the whiskers in like a vacuum cleaner.
Traveling at a speed of 186,000 miles per second, light takes 6 hours to travel from Pluto to Earth.
To an observer standing on Pluto, the sun would appear no brighter than Venus appears in our evening sky.
The telescope on Mount Palomar, California, can see a distance of 7,038,835,200,000,000,000,000 miles.
The sun is 330,330 times larger than the Earth.
The sun is 3 million miles closer to the Earth during the winter than the summer.
The Sun burns 9 million tons of gas a second. At this rate, it has been estimated, it will burn out in another 10 billion years.
The star Zeta Thauri, a supernova, was so bright when it exploded in 1054 that it could be seen during the day.
The star Antares is 60,000 times larger than our sun. If our sun were the size of softball, the star Antares would be as large as a house.