The ancient Greeks proved over 2,000 years ago that the Earth was round and figured out how big it was by using simple observations of the Sun.
But how do people know this today? When you drop anything, gravity causes it to fall directly toward the center of the Earth, at least until it hits the ground. Gravity is a force that is caused by nearly everything that has mass. Mass is a measure of how much material there is in anything.
Protoplanetary disks throw out more material than gets turned into planets
The study comes from Avi Loeb and Amir Siraj. Loeb and Siraj are both from the Center for Astrophysics (CfA) at Harvard and have collaborated on research before. Their new study is titled "Preliminary Evidence That Protoplanetary Disks Eject More Mass Than They Retain.
Loeb and Siraj point to the existence of interstellar objects like "Oumuamua and 2I/Borisov to make their case. So far, there's no conclusive proof for the origin of these objects and their brethren.
Star Home Theater: Dance of the Planets || St. Petersburg College
Ground-based observatories could use starshades to see planets
Those techniques only give us extremely limited information about what those exoplanets are really like. We have to make educated guesses as to their compositions. But astronomy is just like anything else: a picture is worth a thousand words.
The most common method to deal with this interference is through a coronagraph, which is a device inside a telescope that blocks out the light of the star. If the orbiting planet is big enough and bright enough (usually in the infrared due to its own heat emission), we can get a direct picture.
Finding Earthlike planets in other solar systems by looking for moons
Eggl said astronomers using the Atacama Large Millimeter Array have recently observed what they believe is evidence of a moon forming around the extrasolar planet PDS 70c. The next step is finding moons around planets that have two stars.
Some planets in other solar systems can be seen using very large telescopes like ALMA, the W.M. Keck observatory in Hawaii or the European Southern Observatory in Chile, but fully formed moons are still too tiny to spot.
Many Sunlike Stars Gobbled up Some of Their Planets - Universe Today
New research shows that other sunlike stars in our galaxy aren’t so kind to their planets. Up to a quarter of them may consume planets before they even establish a solar system.
Binary sunlike stars should be identical twins. They come from the same protostellar gas cloud. They formed with the same primordial soup of ingredients. They had similar formation histories , even to the point of having nearly the same size. They should look, act, and even smell the same.
BYU finally gets its Big 12 moment: How 'the planets aligned' to bring the Cougars back from
BYU finally gets its Big 12 moment: How 'the planets aligned' to bring the Cougars back from independence
Swatch BIG BOLD PLANETS collection | HYPEBEAST
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Mercury snuggles up to the crescent moon tonight | Space
The tiny planet Mercury will make a close approach to the crescent moon in the evening sky tonight (Sept. 8), but the pair may be difficult to observe.
Mercury and the moon will be just above the western horizon at sunset, which means you won't have much time to observe Mercury before it, too, sinks below the horizon. Although the planet will be up in the sky before sunset, it can be difficult and dangerous to see it in the sun's bright glare
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