A few facts about Neptune 🔵

• Due to its very significant distance from Earth, Neptune is an extremely difficult target to study. It has only been visited by one spacecraft so far in its history. That honor went to the Voyager 2 probe, which made a close flyby of the planet in August 1989.

• Neptune has its own ring system, consisting of five main rings. They are much smaller and dimmer than Saturn's famous rings and are mostly made up of particles likely covered in organic material, giving them a reddish hue.

• Neptune is the most distant planet in the solar system. It orbits at a distance of about 4.5 billion kilometers from Earth. Neptune makes one revolution around the Sun in 164 years.

A few facts about Mars 🪐

• The satellites of Mars were named after twin brothers from Greek mythology.

• An elephant on Mars will weigh less than on Earth. All because of the weak gravitational force. If an elephant weighing 5000 kg got to Mars, it would weigh about 1900 kg there.

• This planet has the highest mountain in the solar system. It's called Olympus. Its summit is 28 km from the surface.

Did you know the price of one NASA spacesuit? 🧑‍🚀

The first spacewalk by a team of female astronauts was postponed due to a spacesuit shortage and will take place in October 2019. NASA has invested more than $200 million to develop new spacesuits. Despite that, the agency has only 11 usable space suits on hand, according to a report by Inspector General Paul Martin.

According to NASA engineer Pablo de Leon, each suit weighs more than 150 kilograms and costs $22 million.

Earth's history in one year 🌍

If you compress the entire history of the Earth (4.5 billion years) into one year, you get:

• Life on Earth appeared in mid-March

• The first land animals didn't appear until late November.

• Age of the dinosaurs December 8 through December 25

• The emergence of the human mind December 31 at 23:40.

• The Industrial Revolution hit just 1 second before New Year's Eve.