Earth facts: Size, distance from the Sun, orbit | Astronomy.com
网页2023年10月20日 · Earth is the third planet from the Sun and takes 23 hours, 56 minutes to spin on its axis one time. Size: Earth has a diameter of 7,926 miles (12,756 kilometers). Distance from the Sun: Earth is ...
Constellations: How to spot them all - Astronomy Magazine
网页2023年11月16日 · Continuing the arc, you’ll “sprint to Spica.”. This blue-white 1st-magnitude star is in Virgo, which is a huge, sprawling constellation. If you look below and to the right of Spica, you’ll ...
Understanding the phases of the Moon | Astronomy.com
网页2023年8月30日 · There are eight distinct phases the Moon goes through. Beginning with New Moon, they are: New Moon: The New Moon phase marks the beginning of the lunar cycle. During this phase, the Moon is ...
Astronomy Magazine: Space News, Observing, Planets, Galaxies
网页Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes ...
How Did the Big Bang Happen? | Astronomy.com
网页2019年7月1日 · The universe cooled rapidly as it blew outward, however, and by 10–35 second after the Big Bang, the epoch of inflation occurred, enlarging the universe by a factor of 1050 in only 10–34 ...
News | Astronomy.com
网页Visit The Space Store. Your destination for the latest astronomy news on planets, stars, galaxies, cosmology, observing events, space missions, and more.
Planets 101: What they are and how they form | Astronomy.com
网页2023年10月18日 · Planets arise from the remnants inside a protoplanetary disk that encircles a nascent star. Dust and gas within such disks slowly sticks together, forming the building blocks of planets, known as ...
Mercury: Size, distance from the Sun, orbit | Astronomy.com
网页2023年10月20日 · Size: Mercury is about 3,032 miles (4,880 kilometers) across.That makes it the smallest planet in the solar system. In fact, Mercury is just a little larger than Earth’s Moon.Distance from the ...
A brief history of time: What is it and how do we define it?
网页2022年1月6日 · In October 1884, delegates from around the world gathered in Washington, D.C., at the International Meridian Conference. The goal was to determine “a common zero of longitude.”. Each of the 24 ...
Jupiter: Size, distance from the Sun, orbit | Astronomy.com
网页2024年4月19日 · Size: Eleven Earths would fit side by side across the face of Jupiter. It is the biggest planet in the solar system, and it has a diameter of 89,000 miles (143,000 kilometers). Distance from the ...