And because we know how massive the stars are-- we vaguely understand stars-- we can work out that the thing at the center that they're orbiting must weigh a few million times the mass of the Sun-- and that mass must be crammed into a volume of spacethat would fit within the orbit of Neptune.
There is a nucleus, a middle of the atom, which we now know is full of protons and neutrons, and there are electrons orbiting around the atom, OK?The problem is that, even though this is consistent with certain pieces of data, it can't be true as the final answer, at least,
But before that, we flew flybys of about two kilometers. Orbiting a changing comet environment, and I'll tell a little bit of the story about how the spacecraft saved one time whenwe flew too closely.
Earth Engine in a very, very short form is what happens when you take all of the images that come from the many dozens of scientific spacecraft orbiting the planet run by the US government and other governments, take the data out of these sorts of archives,and put them into this sort of place, which is a Google data center where we put all of the image data co-located
And every time I think about that discovery it just blows my mind that we little creatures here on this one planet orbiting an ordinary star in one galaxy can figure out that our whole universe beganat a certain finite time in the past and actually calculate when that was.
An unknown landing environment, we'll talk more about that later. And orbiting a low-gravity body. Just to give you an idea of the scale of the Rosetta mission, 26 instruments on both the Lander and Orbiter.
know. And according to the algorithm, you're someone that watches our show, but you haven't yet hit that button. Exoplanet planet orbiting another star.
conditions. So that's the Mustafar like planet from uh from that third Star Wars these really big close orbiting planets which are both intrinsically interesting
They're a little bit more chaotic, kind of like a beehive. They're still orbiting the center, very secure, stable orbits, but they're not all sort of in a nice, flat plane anymore. They're very much very chaotic, like a beehive.
They keep people physically and mentally healthy. and their values are orbiting around that kind of connectivity.
But all those things are good. because it was orbiting in a swarm of material left over from the formation of the sun.
Just by the nature of space and time, everything gets stretched and squeezed into an infinitely thin line. They're orbiting each other.
If you look closely, it'll show you spacecraft orbiting our Sun. Kepler spacecraft is actually orbiting our Sun, not orbiting our Earth. And if you could zoom into part of Earth, and here it will click on the West Coast of North America and showing you what our spring night sky looks like.
We don't have a way to downlink data, a lot of it. And Kepler is orbiting our Sun, just like Earth is. It's in an Earth-trailing orbit .
for planets. So let's imagine for a moment we could transport ourselves to one of these, not the TRAPPIST ones, but some planets orbiting a slightly bigger star. And so it's orbiting the star with short periods.
We're so proud of this team. So Dawn-- it's orbiting another dwarf planet called Ceres. It's in between Mars, Jupiter in the asteroid belt.
Planes, the moon, the sun, tides-- everything rings this machine. They're orbiting each other in the final seconds of their life together.
That's the sample that's going to allow us to calculate the fraction of stars in our galaxy that host small, potentially habitable planets. Kepler-186 is orbiting one of these really low-mass stars, what we call an M dwarf.
Cassini has been orbiting around Saturn and visiting the moons of Titan.
This is the Earth orbiting system.
- Positronium is an electron and a positron orbiting each other like a binary star system.
And nuclear weapons are not orbiting above us as we speak because of the decisions made back then.
or that they're just orbiting with and exchanging mass with, or if these stars are spinning very quickly, or if they have some other quirk of their chemistry
Just by the nature of space and time, everything gets stretched and squeezed into an infinitely thin line. So two black holes can be orbiting each other.
You can think of ISS as an orbiting lab, except it's in space, where you can do experiments, iteration, and very fast development.
You mentioned the comet itself is about four kilometers in diameter or some equivalent of that. And then the orbiter was orbiting at a distance like 10 kilometers on average? It depends. During the highest activity, we'd have to be closer to 30 kilometers, 30 to 50 kilometers.
Basically, as the comet is more active, the atmospheric gas, the coma pushing you away from it, is much more than the gravity. So you're really not orbiting it. That's why we were flying those line segments.
It's a planetary system with planets orbiting around them.
We're on a huge rock orbiting a fireball.
So this is an artist's rendering of the planet 51 Pegasi b. It is a Jupiter-sized planet orbiting tens of times closer to its parent star than Mercury is to our own sun. It only takes about three days for it to orbit its star once.
It only takes about three days for it to orbit its star once. So it's a giant planet orbiting very close. In our own solar system, we have the rocky, small things on the inside, and we've got the giant things on the outside, beyond what we call the ice line.
or brightness-- those are all indications of how big a planet is. Temperature is how close the planet is orbiting to its parent star. So knowing something about the planet's orbit tells you something about the energetics and how much life-enabling energy that planet is receiving.
These planets that are plotted here for you are dynamically compact systems. These are planets that are orbiting pretty close to one another, so that's why we call them compact. And in these scenarios, the disk is so flat-- if our solar system were a pancake, this would be like a crepe.
That's the sample that's going to allow us to calculate the fraction of stars in our galaxy that host small, potentially habitable planets. Trying to find a planet orbiting a star-- like taking a picture of it-- is like trying to see a gnat next to a searchlight.
If you measure the distance of something orbiting it and the orbital speed.
For a simple two body system like the Earth orbiting the sun, that combined potential look something like this.
They power everything from laptops and electric vehicles to orbiting satellites.
conditions. So that's the Mustafar like planet from uh from that third Star Wars What we have here is a pair of stars orbiting their common center of mass.
And the cluster ones were going to be orbiting the Earth, tracking the Earth's magnetic field and how it responds to changes from the sun.
And then we still have the orbiter that was still orbiting around or flying around the comet at the time and doing its own work.
Just by the nature of space and time, everything gets stretched and squeezed into an infinitely thin line. And so what you'll notice is as they're orbiting , the amplitude is increasing.
and it will actually zoom into that part of the sky and show you a schematic of the planets orbiting that star. And look at this one has five planets orbiting the star. And those are the relative spacing of the orbits.
They know the approximate region. They can infer the orientation for some Earth orbiting CubeSats like the IPEX CubeSat that I was a PI for. You actually build a tumble model from the periodic current data from the solar panels.
One of them compared it to a planet orbiting a point.
Kepler observed a patch of sky for four years. So in order to find an Earth analog orbiting at 365.25 days, you need to see it not just once, but twice-- actually three times-- to get a unique determination of its orbital period.
So this is just pointing out that there's a lot of possibility to consider. Kepler has also found a class of planets that's orbiting , also, 10 times closer to its star than Mercury is to our own solar system, but planets that we know are rocky, because we've measured their size-- their radius-- but also their mass.
The G-type star would be bigger, so we've got an incorrect size ratio here for these Tatooine stars. But what this tells you is that the planet is orbiting not just one of them-- it's orbiting both of them. So you've got not just one star rising in the east and setting in the west, but you've got two.
So you've got not just one star rising in the east and setting in the west, but you've got two. Moreover, those stars are orbiting one another, gradually changing position in the sky, and they're eclipsing one another.
That's the sample that's going to allow us to calculate the fraction of stars in our galaxy that host small, potentially habitable planets. So this tells us that small planets-- at least orbiting within an Earth-like orbit -- are much more common than Neptunes and giant planets.
And we also have little dwarf galaxies that are orbiting the Milky Way as well.