Recent comments in /f/askscience

jrob323 t1_j4zjml5 wrote

> If humanity really put their mind to it, went all out and built an Orion type spacecraft, we could probably get it there within 3000 years or so.

What are the chances that this spacecraft could travel at relativistic speed through space for 3000 years without encountering a speck of dust and detonating with the energy of a hydrogen bomb?

3

dumb_password_loser t1_j4zja46 wrote

But the spread angle is inversely proportionate to the aperture.
If you send multiple probes that spread out a bit and couple them optically, they can transmit coherently with a huge effective aperture. (like the reverse of a telescope array)

And if the black hole is big enough, you can maybe use its gravitational field to increase the aperture using some mathematical sorcery.

2

InfernalOrgasm t1_j4ziyp1 wrote

And at the root of it all is this magical thing called quantum mechanics; wherein particles that don't even exist ... amount to observable, tangible, forces? It's really complicated

−13

anon525as t1_j4zidhj wrote

Idk about chromosomes part of this post's context. But adding to the evolution part for anyone who's interested.

When cells divide and grow the genetic code isn't copied 100% correctly. There are errors, some get fixed some don't. The ones that don't get fixed and continue to exist are what we call cancer.

Genetic mutation is a random thing that just happens when cell divide and grow because of not 100% being copied exactly the same. If there is a mutation which gives the individual an edge over other beings of the same species then it becomes easier for them to survive and reproduce. As their offspring increase and the ones with this mutation absent die or have less offsprings we see what we know as "nature's selection"

−13

BobSmithTheRockeeter t1_j4zhg8n wrote

As the probe would approach black hole the time around it will slow down and it would take thousands of thousands of years for the probe to fall in, from the probe perspective it would take a couple of minutes of course. Also after it crosses event horizon we can no longer get information what’s going on as even weightless radio waves are getting pulled in

1

ozspook t1_j4zdloy wrote

If humanity really put their mind to it, went all out and built an Orion type spacecraft, we could probably get it there within 3000 years or so.

It's very helpful that the intended destination is to plunge into a black hole, this means we don't need to flip and slow down halfway, so we put more fuel mass fraction into the initial acceleration and we can just smack into it at relativistic velocities.

Transmitting back could be done by a much smaller relay satellite shot backwards some distance from the target, unfurling a massive mylar solar sail with a clever 'shutter' system, using the black hole's accretion disk or a close star as the light source, like a morse light on a ship.. We will work it out.. Of course nothing passes the event horizon but we might get some neat close up images and data for a short while.

2

supagirl277 t1_j4zcn2c wrote

The way that they infect people are different because animals and humans have different proteins for them to attach to. It has to bind to a specific protein that they’ve adapted to, and if it’s not present, it can’t attach. They have to find a way into the host without getting caught, so they sort of sneak in using mechanisms that the body won’t recognize.

1

AdEnvironmental8339 t1_j4zcmav wrote

Hey i want to ask, if the person has 2 alleles , 1 positive with sickle cells another is a normal function allele.

So is the sickle cell allele still working and you make false proteins but with the another allele still works normally then you still can be alive because your blood now consist both false hemoglobins and normal hemoglobins ( and the normal hemoglobins is in sufficient amount for you to be alive ? ).

I thought at first if an allele is reccessive and another one dominant then the reccessive allele will be locked , only the dominant will be working or switch ON. So whats wrong can you please explain..

1